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 A038977 #16 Jul 08 2025 22:36:58 %S A038977 2,5,11,17,47,53,67,71,73,79,89,97,107,109,131,139,157,167,173,179, %T A038977 199,223,227,233,251,257,263,269,271,277,283,307,311,317,331,347,367, %U A038977 373,401,409,443,449,461,463,467 %N A038977 Primes p such that 89 is a square mod p. %H A038977 Vincenzo Librandi, <a href="/A038977/b038977.txt">Table of n, a(n) for n = 1..1000</a> %t A038977 Select[Prime[Range[120]], ! JacobiSymbol[89, #] == -1 &] (* _Vincenzo Librandi_, Sep 08 2012 *) %K A038977 nonn %O A038977 1,1 %A A038977 _N. J. A. Sloane_