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 A038892 #17 Jul 08 2025 22:27:01 %S A038892 2,7,11,13,23,29,37,41,43,47,53,83,89,97,109,113,131,139,163,173,181, %T A038892 191,193,199,239,241,251,257,263,269,271,281,283,293,311,317,337,347, %U A038892 359,367,373,401,409,419,421,433 %N A038892 Primes p such that 19 is not a square mod p. %C A038892 Also, only entries p=1 (mod 4) of the sequence are not squares mod 19 (from the quadratic reciprocity law). - _Lekraj Beedassy_, Jul 21 2004 %H A038892 Vincenzo Librandi, <a href="/A038892/b038892.txt">Table of n, a(n) for n = 1..1000</a> %t A038892 Select[Prime@Range[120], JacobiSymbol[19, #] == -1 &] (* _Vincenzo Librandi_, Sep 08 2012 *) %Y A038892 Cf. A297176 %K A038892 nonn %O A038892 1,1 %A A038892 _N. J. A. Sloane_ %E A038892 Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 08 2012