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 A038936 #10 Jul 08 2025 22:31:56 %S A038936 5,11,13,17,23,31,37,47,67,79,83,97,101,103,109,127,131,137,149,151, %T A038936 181,191,193,197,211,223,233,239,241,251,263,307,311,331,337,347,353, %U A038936 359,373,379,389,409,419,421,433 %N A038936 Primes p such that 57 is not a square mod p. %H A038936 Vincenzo Librandi, <a href="/A038936/b038936.txt">Table of n, a(n) for n = 1..1000</a> %t A038936 Select[Prime@Range[120], JacobiSymbol[57, #] == -1 &] (* _Vincenzo Librandi_, Sep 09 2012 *) %o A038936 (PARI) select(n->!issquare(Mod(57,n)),primes(100)) \\ _Charles R Greathouse IV_, Sep 09 2012 %K A038936 nonn %O A038936 1,1 %A A038936 _N. J. A. Sloane_