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 A216690 #16 Sep 15 2012 03:18:31 %S A216690 5,7,13,17,23,29,31,37,41,47,53,61,71,79,97,101,103,109,127,137,149, %T A216690 151,157,167,173,181,191,193,197,199,223,229,239,241,263,269,271,277, %U A216690 293,311,313,317,349,359,367,373,383,389,397 %N A216690 Primes p such that x^4 = -2 has no solution mod p. %C A216690 Complement of A051071 relative to A000040. %H A216690 Vincenzo Librandi, <a href="/A216690/b216690.txt">Table of n, a(n) for n = 1..1000</a> %t A216690 ok[p_]:= Reduce[Mod[x^4 + 2, p] == 0, x, Integers] == False; Select[Prime[Range[100]], ok] %Y A216690 Cf. A000040, A051071. %K A216690 nonn,easy %O A216690 1,1 %A A216690 _Vincenzo Librandi_, Sep 15 2012