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 A038887 #9 Jul 08 2025 22:26:25 %S A038887 2,3,5,7,11,17,43,53,59,61,67,71,103,109,113,127,131,137,163,173,179, %T A038887 181,191,197,223,229,233,239,241,251,257,283,293,307,311,317,349,353, %U A038887 359,367,409,419,421,431,463,479 %N A038887 15 is a square mod p. %H A038887 Vincenzo Librandi, <a href="/A038887/b038887.txt">Table of n, a(n) for n = 1..1000</a> %t A038887 Select[Prime[Range[100]], JacobiSymbol[15, #] != -1 &] (* _Vincenzo Librandi_, Sep 07 2012 *) %K A038887 nonn %O A038887 1,1 %A A038887 _N. J. A. Sloane_