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 A134921 #7 Oct 13 2013 03:50:03 %S A134921 1,4,5,9,11,14,15,16,21,24,25,31,35,39,41,46,50,54,55,60,70,71,74,75, %T A134921 79,80,81,86,101,104,106,114,120,125,131,134,136,144,146,150,151,154, %U A134921 161,166,169,170,176,179,184,185,186,199,201,224,234,235,236,240,244,249 %N A134921 a(n) = A132398(n)/6. %H A134921 Zak Seidov, <a href="/A134921/b134921.txt">Table of n, a(n) for n = 1..1000.</a> %F A134921 a(n) = A132398(n)/6. %o A134921 (PARI) isok(n) = isprime(396*n^2 + 1); \\ _Michel Marcus_, Oct 13 2013 %Y A134921 Cf. A132398. %K A134921 nonn %O A134921 1,2 %A A134921 _Zak Seidov_, Nov 15 2007