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 A038899 #9 Jul 08 2025 22:27:46 %S A038899 2,5,11,13,17,19,23,37,59,67,79,83,103,109,113,127,149,163,191,197, %T A038899 199,227,229,233,257,263,293,307,311,313,317,331,337,349,367,379,397, %U A038899 421,433,439,461,499,503,509,521 %N A038899 26 is a square mod p. %H A038899 Vincenzo Librandi, <a href="/A038899/b038899.txt">Table of n, a(n) for n = 1..1000</a> %t A038899 Select[Prime[Range[100]], JacobiSymbol[26, #] != -1 &] (* _Vincenzo Librandi_, Sep 07 2012 *) %K A038899 nonn %O A038899 1,1 %A A038899 _N. J. A. Sloane_