This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A321001 #20 Nov 01 2018 15:56:02 %S A321001 1667,6673,6679,10667,15667,16673,25667,31667,34667,36671,36677,39667, %T A321001 42667,45667,46679,49667,52667,54667,55667,56671,57667,61667,63667, %U A321001 64667,66701,66713,66721,66733,66739,66749,66751,66763,66791,66797,70667,76667 %N A321001 Primes which contain the fax number of the beast (667). %C A321001 Since the so-called beastly primes (containing the digit string 666) were mentioned recently in a Numberphile video (see link), I guess it is now OK to include these numbers (which are based on the old convention that your fax number was one more than your telephone number) in the OEIS. %C A321001 Note that there is no analog of A232448, because 1 0^k 667 0^k 1 is always divisible by 3 and is never prime. %H A321001 Tony Padilla and Brady Haran, <a href="https://youtu.be/zk_Q9y_LNzg">The Most Evil Number</a>, Numberphile Video, October 2018 %H A321001 Margaret Wertheim, <a href="http://www.cabinetmagazine.org">The Fax Numbers of the Beast, and Other Mathematical Sports: An Interview with Neil Sloane</a>, Cabinet Magazine, Issue 57, Spring 2015, pages 48-54. %Y A321001 Cf. beastly primes A131645, also A232448. %K A321001 nonn,base %O A321001 1,1 %A A321001 _N. J. A. Sloane_, Nov 01 2018