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 A038920 #11 Jul 08 2025 22:30:10 %S A038920 3,7,11,13,17,19,29,47,53,67,71,79,89,97,101,109,137,149,151,157,167, %T A038920 179,181,191,193,199,211,227,229,233,239,257,263,281,293,311,313,317, %U A038920 331,347,383,397,421,439,457,463 %N A038920 Primes p such that 41 is not a square mod p. %C A038920 Also, primes p that are not squares mod 41 (from the quadratic reciprocity law). - _Lekraj Beedassy_, Jul 13 2004 %H A038920 Vincenzo Librandi, <a href="/A038920/b038920.txt">Table of n, a(n) for n = 1..1000</a> %t A038920 Select[Prime@Range[120], JacobiSymbol[41, #] == -1 &] (* _Vincenzo Librandi_, Sep 09 2012 *) %K A038920 nonn %O A038920 1,1 %A A038920 _N. J. A. Sloane_ %E A038920 Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 09 2012