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 A023257 #22 Sep 08 2022 08:44:47 %S A023257 2,11,13,17,31,37,41,43,71,73,79,83,97,137,139,151,163,181,191,193, %T A023257 197,269,277,307,317,347,373,409,431,503,577,743,811,823,911,919,941, %U A023257 967,983,1021,1033,1049,1051,1093,1163,1187,1201,1361,1373,1423,1493,1571,1597 %N A023257 Primes that remain prime through 2 iterations of function f(x) = 6x + 5. %C A023257 Primes p such that 6*p+5 and 36*p+35 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023257 John Cerkan, <a href="/A023257/b023257.txt">Table of n, a(n) for n = 1..10000</a> %o A023257 (Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(6*n+5) and IsPrime(36*n+35)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023257 Subsequence of A023221. %K A023257 nonn %O A023257 1,1 %A A023257 _David W. Wilson_