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 A038904 #12 Jul 08 2025 22:28:17 %S A038904 11,23,31,41,43,47,53,59,61,67,73,79,89,97,109,131,151,163,167,173, %T A038904 179,181,193,197,199,229,251,263,271,281,283,293,307,313,317,337,349, %U A038904 383,401,419,421,433,439,449,457 %N A038904 Primes p such that 30 is not a square mod p. %C A038904 Also primes p such that p divides 6^(p-1)/2 + 5^(p-1)/2 - _Cino Hilliard_, Sep 06 2004 %C A038904 Primes p such that p divides 7^(p-1)/2 - 1. - _Cino Hilliard_, Sep 06 2004 %H A038904 Vincenzo Librandi, <a href="/A038904/b038904.txt">Table of n, a(n) for n = 1..1000</a> %t A038904 Select[Prime@Range[120], JacobiSymbol[30, #] == -1 &] (* _Vincenzo Librandi_, Sep 09 2012 *) %K A038904 nonn %O A038904 1,1 %A A038904 _N. J. A. Sloane_