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 A067908 #12 Feb 14 2015 21:11:21 %S A067908 2,3,5,7,11,13,29,47,101,257,349,1201,1907,3533,122449,360233,420271, %T A067908 9172043,10700717,11015860931,825141735599,8577010309290077, %U A067908 25232684617711471,34344487396329503,63627402961872791 %N A067908 Primes of the form floor((7/6)^k). %H A067908 Charles R Greathouse IV, <a href="/A067908/b067908.txt">Table of n, a(n) for n = 1..52</a> %o A067908 (PARI) for(n=1, 1e3, if(ispseudoprime(t=floor((7/6)^n)), print1(t", "))); v \\ _Charles R Greathouse IV_, Feb 17 2011 %K A067908 nonn %O A067908 1,1 %A A067908 _Benoit Cloitre_, Mar 03 2002