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 A038900 #8 Jul 08 2025 22:27:54 %S A038900 3,7,29,31,41,43,47,53,61,71,73,89,97,101,107,131,137,139,151,157,167, %T A038900 173,179,181,193,211,223,239,241,251,269,271,277,281,283,347,353,359, %U A038900 373,383,389,401,409,419,431,443 %N A038900 Primes p such that 26 is not a square mod p. %H A038900 Vincenzo Librandi, <a href="/A038900/b038900.txt">Table of n, a(n) for n = 1..1000</a> %t A038900 Select[Prime@Range[120], JacobiSymbol[26, #] == -1 &] (* _Vincenzo Librandi_, Sep 08 2012 *) %K A038900 nonn %O A038900 1,1 %A A038900 _N. J. A. Sloane_ %E A038900 Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 08 2012