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# 357686312646216567629137 - Numberphile

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**Published on Jul 27, 2018**

Truncatable Primes with Dr James Grime... Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ Dr James Grime is available for public talks. See his website: http://singingbanana.com More videos with Dr Grime: http://bit.ly/grimevideos The Eastaway Prime Pencil (Pack of 11 via Mathsgear): http://bit.ly/35768631264621656762913... Truncatable Prime T-Shirts by Numberphile US: https://teespring.com/truncatable-pri... EU: https://teespring.com/truncatable-pri... Prime number videos: http://bit.ly/primevids Discuss this video on Brady's subreddit: https://redd.it/92bx0p Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outr... And support from Math For America - https://www.mathforamerica.org/ NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Numberphile T-Shirts: https://teespring.com/stores/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9

Numberphile6 months agoCheck out Brilliant (episode sponsor):

Sebastian Elytron6 months agoThat title tho... Good luck to anyone who searches for this video in the future.

Heavenly Controller6 months ago (edited)Always in our prime

J J6 months agoA sharpened pencil with that number would also be a prime piece of stake.

Alp Erol6 months agoI'll have two Number 9's, a Number 9 Large, a Number 6 with extra Dip, a Number 7, Two Number 45's, one with Cheese, and a large Soda.

Tantusar6 months ago (edited)Four two-digit deletable primes are "arbitrarily" deletable, i.e. removing either digit will return a prime number: 23, 37, 53 and 73. Any higher-digit arbitrarily deletable primes cannot, therefore, contain any numeral but 2, 3, 5 or 7, because to do so would introduce the possibility of reaching a two-digit number other than those four while deleting. But we can't go any further. Adding any of those numerals to any of the two-digit numbers introduces the possibility of reaching a different two-digit number. It can therefore be posited that the list of

Rafael Sierra6 months agoUnless you sharpen that pencil so that 8 becomes a 3 and now you no longer have a prime number :)

trexpaddock6 months agoSo, is 1979339339 a 'Parker' right truncatable prime then?

Olbaid Fractalium6 months agoIf it's 739397, it's okay with an eraser.

Jonathan Seiersen6 months agoHey, Brady!

kiffe226 months ago7:40

nivolord6 months ago (edited)I believe all random digit remove primes are: 2, 3, 5, 7, 23, 37, 53, 73.

tommihommi16 months agoof course the "random digit deletable" primes exist, example: 23

Henry Bownes6 months agoPencil primes is a nicer name than truncatible primes

TheÆtherPlayer/Azωת6 months agoIn the long System this number would be spelled out like that :

jake6 months agoI love prime numbers

Joshua Hillerup6 months agoSo, how do you know there's only finitely many end points? Brute force?

Eren Yalçın6 months agoJames Prime is Bacc

Zsemberi Dániel6 months agoWhat about adding 0s to these. Like 103 -> 03 > 3?

jonas6 months agoNever knew math could be this interesting!