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Prime Pyramid (with 3Blue1Brown) - Numberphile 

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Grant Sanderson (from 3Blue1Brown) shows us a pyramid that spits out prime numbers - and then we dig deeper.
More links & stuff in full description below ↓↓↓
See all three videos in this series - Grant's Prime Pattern Trilogy: bit.ly/PrimePatternTrilogy
Grant's own false pattern video: • Researchers thought th...
Grant's channel is 3Blue1Brown: / 3blue1brown
More Grant on Numberphile: bit.ly/Grant_Numberphile
Grant on the Numberphile Podcast: • The Hope Diamond (with...
Numberphile is supported by the Simons Laufer Mathematical Sciences Institute (formerly MSRI): bit.ly/MSRINumberphile
We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. www.simonsfoundation.org/outr...
And support from The Akamai Foundation - dedicated to encouraging the next generation of technology innovators and equitable access to STEM education - www.akamai.com/company/corpor...
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Videos by Brady Haran
Patreon: / numberphile
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Special thanks to our friend Jeff for the accommodation and filming space.

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5 ноя 2022

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Комментарии : 438   
@numberphile
@numberphile Год назад
Part 1 of this three-part interview is at: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jhObLT1Lrfo.html Part 3 of this three-part interview: STILL BEING EDITED
@FebruaryHas30Days
@FebruaryHas30Days Год назад
First reply
@Anonymous-df8it
@Anonymous-df8it Год назад
Second reply
@volodyadykun6490
@volodyadykun6490 Год назад
Still
@Anonymous-df8it
@Anonymous-df8it Год назад
@@volodyadykun6490 Fourth reply
@Jono4174
@Jono4174 Год назад
Skewes’s number-th reply
@tommihommi1
@tommihommi1 Год назад
Suddenly out of nowhere, a Function named after Euler appears. Feel like that's a fundamental rule of mathematics
@zmaj12321
@zmaj12321 Год назад
Euler's totient function is REALLY essential to anything involving number theory. Not surprising.
@tyle.s9084
@tyle.s9084 Год назад
@Paolo Verri And Gauss always found out about it when he was four years old
@otonanoC
@otonanoC Год назад
Everything in math was invented by Euler or Riemann.
@louisrobitaille5810
@louisrobitaille5810 Год назад
@@otonanoC Euler or Gauss* 😝. Riemann just built a few things on Gauss' work 👀.
@tommihommi1
@tommihommi1 Год назад
@@zmaj12321 I only knew it as doing some neat thing for RSA.
@volodyadykun6490
@volodyadykun6490 Год назад
"Prime numbers are, like, the sexiest numbers available" Grant Sanderson, 2022
@1224chrisng
@1224chrisng Год назад
as James Grime would point out, we do have Sexy Primes, twin primes with a gap of 6
@birdbeakbeardneck3617
@birdbeakbeardneck3617 Год назад
Shheeeeeshh
@lonestarr1490
@lonestarr1490 Год назад
@@1224chrisng Dude! There might be children reading this thread!
@dyld921
@dyld921 Год назад
Grant Sanderson is, like, the sexiest mathematician available.
@kadefringe
@kadefringe Год назад
I phap on prime numbers indeed
@wehpudicabok6598
@wehpudicabok6598 Год назад
Grant: "1/5, 2/5 --" me: "red fifth, blue fifth"
@ps.2
@ps.2 3 месяца назад
Oh, what a lot of fifths there are!
@Rubrickety
@Rubrickety Год назад
That silently-corrected "1/3" at 3:38 may be the first error I've ever seen Grant make 😂. The man is as smooth as an infinitely-differentiable function.
@theadamabrams
@theadamabrams Год назад
For anyone confused, the correction 1/3 → 2/3 happens around 3:49
@berryzhang7263
@berryzhang7263 Год назад
Omg yeah I was so confused when I saw the error lol
@leftaroundabout
@leftaroundabout Год назад
If he didn't make any errors _at all_ he would be smooth like an analytic function. But that would be boring, because then you could represent him entirely by his Taylor expansion. _Countably_ many values, that can't be enough!
@axp_bubbles
@axp_bubbles Год назад
If you watch the live streams he did during early pandemic days he makes a lot of errors while writing, and is very candid about them. Just a genuinely humble and brilliant human being.
@SmileyMPV
@SmileyMPV Год назад
@@leftaroundabout not all smooth functions are analytic though but any continuous function is still determined by its rational evaluations, so in order to not be determined by only countably many values you do need to be discontinuous :P
@mxlexrd
@mxlexrd Год назад
An unlisted video from an unlisted video? Now we're in a super exclusive club!
@krokorok_
@krokorok_ Год назад
:D
@viliml2763
@viliml2763 Год назад
What video did you come from? I came from a listed video.
@mxlexrd
@mxlexrd Год назад
@@viliml2763 It wasn't listed when I made the comment
@ophello
@ophello Год назад
The first video wasn’t unlisted.
@themathhatter5290
@themathhatter5290 Год назад
@@ophello It was when Grant linked it in his own video
@davidgillies620
@davidgillies620 Год назад
The length of successive Farey sequences is OEIS A005728. The Euler totient function is one of the foundational objects of number theory. The fact that the sequence here is one plus the sum of the first n values of the totient function is another of those neat links that almost feel numerological in nature. If memory serves, there have already been Numberphile videos on the link between the Stern-Brocot tree and Farey sequences on the one hand, and Farey sequences and Ford circles on the other.
@conanichigawa
@conanichigawa Год назад
Grant's explanation is awesome, but Brady's analogies make it more accessible to everyone.
@Vaaaaadim
@Vaaaaadim Год назад
We're reaching levels of unlisted that shouldn't even be possible
@viliml2763
@viliml2763 Год назад
What video did you come from? I came from a listed video.
@Vaaaaadim
@Vaaaaadim Год назад
@@viliml2763 part 1 When 3B1B's vid came out today, it linked to part 1, which was unlisted at that time.
@juniperlovelace5262
@juniperlovelace5262 Год назад
Its a special talent to make your thumbnails consistently look like something out of the 90s
@deadlyshizzno
@deadlyshizzno Год назад
Is the third video ever coming? Have been checking back since this one first dropped
@redtaileddolphin1875
@redtaileddolphin1875 Год назад
Your original video on farey sums and ford circle packing is probably my favorite on this channel, and one of my favorite on all of the internet. To watch them suddenly come up in this video was truly a treat
@jazermano
@jazermano Год назад
Since I read your comment and got intrigued, I went and found the video, titled "Funny Fractions and Ford Circles." It's dated at being roughly 7 years old. But it is still has the same awesome Numberphile feel to it. Nice to see some things haven't changed.
@redtaileddolphin1875
@redtaileddolphin1875 Год назад
@@jazermano aw thanks! it’s honestly asmr for me I love how he says “probably” and “pinkie”. 10/10 all math videos should also be asmr
@ShenghuiYang
@ShenghuiYang Год назад
Amazing connection between Euler totient function, Farey and mobius inversion in such a short video.
@razlotan7504
@razlotan7504 Год назад
It's like if you watch only 3b1b videos you would think everyone is as attractive as Grant
@anoopramakrishna
@anoopramakrishna Год назад
3 3 Blue 1 Brown Videos in 1 Day😁 Inception much?
@ZacThompson
@ZacThompson Год назад
3 brown paper videos: you should do 1 on blue paper with him just to complete the inversion
@hlvaneeden
@hlvaneeden Год назад
The sum of digits of that last sequence is not 33, it is 37, which is prime :) (if you count 10 as two digits).
@scottabroughton
@scottabroughton Год назад
But if you insert 10 11s, it comes to 57, which is composite.
@gaborszucs2788
@gaborszucs2788 Год назад
​@@scottabroughton except that for example it's not 1+10, rather, 1+1, which is not 11, so you skip that, plus 10+1 at the end. 57-2x2 is 53 which happens to be a prime... Who'll volunteer for 12?
@scottabroughton
@scottabroughton Год назад
@@gaborszucs2788 Can you provide a visual?
@MichaelJamesActually
@MichaelJamesActually Год назад
Funny how Grant can talk about a sequence of numbers that really doesn't have any sort of significance, and I still enjoy watching it.
@highlewelt9471
@highlewelt9471 Год назад
Grant is always such a delight
@neil5280
@neil5280 Год назад
I check back every day for Part 3.
@neil5280
@neil5280 Год назад
Monday was pretty chill.
@neil5280
@neil5280 Год назад
I don't have the stamina for commenting any more, but I am checking daily. Look forward to Part 3 whenever it arrives.
@neil5280
@neil5280 Год назад
Happy New Year! 🎉
@dkranda
@dkranda Год назад
@9:47 excuse me but Tim “The Moth” Hein is absolutely an A lister!
@toycobra12
@toycobra12 Год назад
I thought it was the guy from the KFC logo 😂
@Michael-cg7yz
@Michael-cg7yz Год назад
7:14 So, we can define it as a function based on the Euler's totient function. one of the definitions of ETF is: phi(n) = sum from k=1 to n of gcd(k,n)*cos(2pi*k/n) then, the sequence would be defined as: 1 + phi(1) + phi(2) + phi(3).... or to rewrite: g(t) = ([sum from n = 1 to t of phi(n)] + 1) and, it still outputs primes even after the break omitted values denoted with ( ), erroneous with [ ] g(t): 2, 3, 5, 7, 11, 13, (17), 19, 23, 29, (31), [33], (37), (41), 43, 47, (53), 59, (61), [65], (67), (71), 73, (79), [81], (83), (89), 97, (101), 103 i mean yes, it breaks worse each time but the only erroneous values up to 100 are [33], [65] and [81]
@lonestarr1490
@lonestarr1490 Год назад
So all we need is a different imperfect prime sequence to use in conjunction with it, where it is guaranteed that the two of them never fail at the same time.
@panadrame3928
@panadrame3928 Год назад
The question then is what is the proportion of non prime sums of φ(n) for n
@Michael-cg7yz
@Michael-cg7yz Год назад
@@panadrame3928 you mean this g(x) or Euler's totient function? I'm fairly sure the first one is independent of primes, so sometimes it'll hit them, sometimes, and that being the larger amount it'll miss them
@JamalanJuda
@JamalanJuda Год назад
My two favorite channels coming together.
@EebstertheGreat
@EebstertheGreat Год назад
I hope part 3 won't be unlisted. If I don't get notified when it's uploaded, I'll probably never see it.
@ericpeterson6520
@ericpeterson6520 Год назад
Is part 3 still in the works?
@joelkronqvist6089
@joelkronqvist6089 Год назад
Seems like it was published today
@Uranyus36
@Uranyus36 Год назад
probably the most fascinating prime pattern that tricks everybody the most is the approximating prime-counting function which leads to the birth of skewes number. even tho skewes number is an over-overestimate i guess the actually point where the prime-counting function changes its size comparison to the actual number of primes < n would still be something huge (like 10 to the power several hundreds?). this completely blasts through the regime of small numbers a mortal could interpret of, but yet at some point the relatively big boys still gonna break the pattern.
@ifroad33
@ifroad33 Год назад
Great mathematician. Great RU-vid content creator. Charismatic as heck. We all wish to be Grant I presume.
@fuuryuuSKK
@fuuryuuSKK Год назад
DEEPER INTO THE VAULT WE GO
@OwlRTA
@OwlRTA Год назад
ENHANCE
@ekxo1126
@ekxo1126 Год назад
@@OwlRTA i just answered on a comment which was an answer to a comment of an unlisted video that I reached from another unlisted video
@viliml2763
@viliml2763 Год назад
​@@ekxo1126 What video did you come from? I came from a listed video.
@AllHailZeppelin
@AllHailZeppelin Год назад
After realizing that the total number of DIGITS in the 10th row stays prime (37), I got hopeful that maybe the number of digits would keep the pattern even if the number of elements (numbers) doesn’t. But alas, at the 11th row the number of digits is 37+2*φ(11), or 57… 😕
@deadlyshizzno
@deadlyshizzno Год назад
I have been coming back here like twice a day waiting for part 3 to be linked in the pinned comment or description! I'm excited for that vid, I could listen to Grant talk about math forever
@deadlyshizzno
@deadlyshizzno Год назад
I'm still checking!
@deadlyshizzno
@deadlyshizzno Год назад
Why is it still being edited 😭
@deadlyshizzno
@deadlyshizzno Год назад
D:
@deadlyshizzno
@deadlyshizzno Год назад
I suppose the third video in this series is somewhere in the backlog now
@deadlyshizzno
@deadlyshizzno Год назад
:(
@happyelephant5384
@happyelephant5384 Год назад
This collab is legendary
@razer1024
@razer1024 Год назад
Best video in a long while 🎉❤
@dhoyt902
@dhoyt902 Год назад
The second number in the rows of Pascal triangle(the counting numbers) will evenly go into every number in the row IFF the number is prime.
@SuperYoonHo
@SuperYoonHo Год назад
Awesome video!
@TheFakeMackie
@TheFakeMackie Год назад
3b1b is a phenom channel. Great collab.
@Par_and_syv_lovers56
@Par_and_syv_lovers56 Год назад
awesome collab
@lucas.cardoso
@lucas.cardoso Год назад
If 1 was a prime number, then the first prime actor would be Sylvester StallONE.
@johnkonrath1115
@johnkonrath1115 Год назад
Loving the trilogy!
@backwashjoe7864
@backwashjoe7864 Год назад
I have a reminder set to look for the 4th / "Resurrections" video in 18 years.
@jamesepace
@jamesepace Год назад
Oh darn, part 3 isn't up yet, which means I'm going to close this tab and forget to come back to see the exciting conclusion. :(
@andrewharrison8436
@andrewharrison8436 Год назад
😃I bet you have already subscribed.
@jamesepace
@jamesepace Год назад
@@andrewharrison8436 Yeah, but if it's unlisted it doesn't show up in the subscriptions list.
@FirstLast-gw5mg
@FirstLast-gw5mg Год назад
Will the 3rd video be published on one of your channels, so that we'll see it?
@nikhilkenvetil1594
@nikhilkenvetil1594 Год назад
What is this, a crossover episode? ❤Great stuff as always!
@jacksonstarky8288
@jacksonstarky8288 Год назад
And the third video is still being edited. But I needed to watch this again anyway. Grant's explanations are so clear and understandable that I keep expecting his channel to come out with a follow-up to his Riemann zeta function video proving the Riemann hypothesis.
@kruksog
@kruksog Год назад
Actually did research work on Farey sums and polynomials and so on. Wild to see some of it shared here. Feels like a fever dream seeing this presented 🙃
@SpySappingMyKeyboard
@SpySappingMyKeyboard Год назад
When adding even numbers (because it's symmetric) to small odd numbers (after the first) it's hard not to hit a prime
@danieluran9555
@danieluran9555 Год назад
This is an unexpected follow up to Dr. Bonahon's video... Great!!
@Sajatzsiraf
@Sajatzsiraf Год назад
This is super cool :) thank you for sharing this with us!
@addymant
@addymant Год назад
Will you upload the third video unlisted?
@bumbleandsimba
@bumbleandsimba Год назад
NUMBERPHILE I LOVE YOU'RE VIDEOS 💗
@xanderalaniz2298
@xanderalaniz2298 Год назад
It would be interesting to see how this works in other Bases. Following the totient function of 10, would it break down in a similar manner in duodecimal, or is it merely a trick of numbers merely being close to each other?
@andrewharrison8436
@andrewharrison8436 Год назад
The totient function is independent of base. It depens on common factors (or lack of them) not on the representation of the number.
@fidgettyspinner3028
@fidgettyspinner3028 Год назад
A nice mathematician's pause when that second "1/3" is noticed and fixed offscreen for the next section.
@zerosir1852
@zerosir1852 5 месяцев назад
My three inventions able to change the all history of mathematics. (1) The Easy Number Theory (2) The Original Remainder Theorem (3) The Prime Pyramid Theorem
@TaranovskiAlex
@TaranovskiAlex Год назад
So... how many times more I have to refresh the page to see the link to the 3rd part? Are you testing if page refreshes contribute to the views number?
@deadlyshizzno
@deadlyshizzno Год назад
Guys the description changed from "STILL BEING EDITED" to "soon"
@abuzzedwhaler7949
@abuzzedwhaler7949 Год назад
Papa Grant here to give us some key geometric intuitions
@a0z9
@a0z9 Год назад
In each row ,the most numerous number is the prime but if tie always choose the prime you Know from the previus rows.
@smizmar8
@smizmar8 Год назад
The quip about 3b1b being "A list" haha, you certainly are too tho Bradey, I literally started learning math in my 20's because of your channels! :D
@leobarlach
@leobarlach Год назад
That's the funny addition video! Classic!
@arandomdiamond2
@arandomdiamond2 Год назад
According to what you said about it being related to the number of fractions with a maximum denominator, this can compute primes! You just need to check how many numbers are added at each step and for step i, if i-1 numbers were added, then i is prime. I checked up to i=3000 too.
@arandomdiamond2
@arandomdiamond2 Год назад
Not very efficient for calculating big primes though
@TheEternalVortex42
@TheEternalVortex42 Год назад
This is just checking the definition of the Euler totient function for primes, since φ(p) = p-1.
@arandomdiamond2
@arandomdiamond2 Год назад
@@TheEternalVortex42 Yes, but I found it interesting since Grant said the "Prime Pyramid" didn't produce primes, and I've never seen primes calculated this way before so I just thought it was cool.
@TheCapcarap
@TheCapcarap Год назад
This is the ultimate video
@GanerRL
@GanerRL Год назад
part 3 is just never occuring i guess?
@Mystery_Biscuits
@Mystery_Biscuits Год назад
It did come out eventually
@deadlyshizzno
@deadlyshizzno Год назад
Part 3 is finally out! Thanks for listening to the like 5 people that were asking for it in this comment section lol :D
@keyaanmatin4804
@keyaanmatin4804 Год назад
How deep does this rabbit hole go?
@toferg.8264
@toferg.8264 Год назад
4:22 so far it is a repeat of the Stern Brocot Sequence and the Funny Fractions video. Which is fine :) . I hope there is more.
@senthilkumaran5255
@senthilkumaran5255 Год назад
neat sleight of hand at 3:47 :)
@hyftar
@hyftar Год назад
Question about the prime pyramid, would the sequence still break if we used another base? (i.e. Would the same sequence in base 16, break at 16?)
@MichaelDarrow-tr1mn
@MichaelDarrow-tr1mn Год назад
it's not a base 10 specific thing
@kingdomadventures
@kingdomadventures Год назад
In this series I saw something I never saw before--veins popping out of Grant's arms. Teach has been lifting!
@EPMTUNES
@EPMTUNES Год назад
Grants always been a great math communicator!
@CorrectHorseBatteryStaple472
7:10 Damn it, it's that Euler guy, again!
@AidanRatnage
@AidanRatnage Год назад
Suddenly, it's not unlisted anymore!
@JamesJoyceJazz
@JamesJoyceJazz Год назад
i want the third ep right now pls thanks in advance loving the material
@bad_manbot
@bad_manbot Год назад
it would be interesting to see the sequence of numbers that are primes that he pyramid skips, and see if they hold any patterns we can recognize
@SgtSupaman
@SgtSupaman Год назад
Another comment did the output to just over 100. Here are the skipped primes they came up with: 17, 31, 37, 41, 53, 61, 67, 71, 79, 83, 89, 101
@jurjenbos228
@jurjenbos228 Год назад
@@SgtSupaman This is not in the OEIS. But the sequence of denominators of Farey sequences is: A006843, and the sequence of numbers of Farey fractions (prime or not) is A005728.
@bad_manbot
@bad_manbot Год назад
@@SgtSupaman nothing quite jumps off the page at me. though it is interesting the differences between the skipped primes from one to the next. 4, 6, 4, 12, 8, 6, 4, 8, 4, 6, 12 way less variability than I expected - though i have a suspicion that this is more due to the "6n+1, 6n-1" nature of primes than anything else. (also given how densely packed they are at the lower end of the number line, as mentioned in this video.)
@axelnilsson6478
@axelnilsson6478 Год назад
Poor Tim!
@cloak_poison2124
@cloak_poison2124 Год назад
THE CROSSOVER I DREAMT OF
@Verlisify
@Verlisify Год назад
Fun video
@ygalel
@ygalel Год назад
1:53 MIND BLOWN
@francescos7361
@francescos7361 Год назад
Thanks .
@ChrisSeltzer
@ChrisSeltzer Год назад
This is why you asked for A list and B list actors on Twitter haha
@IamBATMAN13
@IamBATMAN13 Год назад
Third part where?
@WomenCallYouMoid
@WomenCallYouMoid Год назад
2:10 unit divisors 2:54 4:10: okay, inbetween 2:17 7:00
@stapler942
@stapler942 Год назад
The mediant of two fractions, huh? Is there a submediant? What about a dominant and subdominant? What's the leading tone of two fractions? What's the supertonic?
@thatoneginger
@thatoneginger Год назад
Grant is def a prime number, wish we’d see more of him on his home channel, but pie guy is cute too 😊
@15october91
@15october91 Год назад
3Blue1Brown is the GOAT.
@shrayanpramanik8985
@shrayanpramanik8985 8 месяцев назад
Now if I say to some kid who watches numberphile,that Jennifer Lawrence was in a numberphile video, would they believe it😂?
@leodarkk
@leodarkk Год назад
Well I suppose that one "reason" why you are getting primes at the begining is that this method will never produce an even number, that is guaranteed. It's even weaker than the Paterson method where 2,3 and 5 are excluded as divisors, but it is there :).
@RobertMStahl
@RobertMStahl Год назад
Rydberg is watching (finite structure) crystal eyes ...hydrino autopoiesis?
@bstlang
@bstlang Год назад
On the line for number 10 is doesn't break if you count digits, since it becomes 37, not 33.
@GourangaPL
@GourangaPL 6 месяцев назад
i came up to a problem with similar thing, start with sequence of 111, each next row is the previous sequence as binary number number XOR itself shifted 1 and 2 bits, so 111 XOR 1110 XOR 11100 so 2nd row is 10101, next is 1101011 and so on, find a way to count how many 1 bits are in the nth sequence, i know for n = 2%k the answe is 3, for n=2k it's equal to the answer for n/2, need a formula for the general case
@OwlRTA
@OwlRTA Год назад
lmao, Tim Hein being a very high odd number
@BaccarWozat
@BaccarWozat Год назад
Does the tenth one add up to 33 though? If you count the fact that the number 10 has two digits, you're actually adding 8 instead of 4, making it 37, which is still prime. But there's probably another snag not much further along.
@jasonremy1627
@jasonremy1627 Год назад
If you count each digit in the 10, you get 37, which is prime!
@rainerausdemspring894
@rainerausdemspring894 Год назад
Guy's articles contain some really striking (counter-)examples. I am afraid you need to have access to JSTOR in order to read them.
@n20games52
@n20games52 Год назад
Cool. Just as cool as the food pyramid. ;)
@kp2k
@kp2k Год назад
super cool
@pleappleappleap
@pleappleappleap Год назад
I wonder how the performance of this stacks up against the Sieve of Eratosthenes?
@munjee2
@munjee2 Год назад
Oh there's no fourth unlisted video 😢
@beforeikillyou7430
@beforeikillyou7430 Год назад
His voice🔥
@anonymoususer2756
@anonymoususer2756 Год назад
Thought this was going in the direction of the Stern-Brocot sequence at first
@LegendaryFartMaster
@LegendaryFartMaster Год назад
2:10 As a certain suspender wearing Frenchman would say: "Today, we're looking at frraacctions"
@OmnipotentPotato
@OmnipotentPotato Год назад
Two Hanks Sevenifer Lawrence Wi11 Smith Who came up with these names?
@kirkanos771
@kirkanos771 Год назад
It crashed at 10 but what if we count in base 16 and replace 10 by A. Its 1 less digit. Augmenting the base should delay the moment it crashes, is it ?
@aceman0000099
@aceman0000099 Год назад
I also wondered if it fails at 10 because of base 10. It may be pure coincidence
@user-qo3qm7ud1d
@user-qo3qm7ud1d Год назад
It does not depend on base of number system!
@kirkanos771
@kirkanos771 Год назад
@@user-qo3qm7ud1d That's not our point. Choosing another base may delay the number of iterations before it crashes.
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