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
  • 357686312646216567629137 - Numberphile etiketleri


  • Numberphile

    Check out Brilliant (episode sponsor):

  • That title tho... Good luck to anyone who searches for this video in the future.

  • Always in our prime

  • J J 

    A sharpened pencil with that number would also be a prime piece of stake.

  • If it's 739397, it's okay with an eraser.

  • I'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.

  • 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

  • So, is 1979339339 a 'Parker' right truncatable prime then?

  • Unless you sharpen that pencil so that 8 becomes a 3 and now you no longer have a prime number :)

  • Hey, Brady!

  • I love prime numbers

  • I believe all random digit remove primes are: 2, 3, 5, 7, 23, 37, 53, 73.

  • of course the "random digit deletable" primes exist, example: 23

  • James Prime is Bacc

  • Pencil primes is a nicer name than truncatible primes

  • 7:40

  • So, how do you know there's only finitely many end points? Brute force?

  • In the long System this number would be spelled out like that :

  • Never knew math could be this interesting!

  • When you're out of video titles ideas :D