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 A216743 #4 Sep 15 2012 14:11:47 %S A216743 5,7,13,17,19,23,29,31,37,41,47,53,61,67,71,73,79,89,97,101,103,109, %T A216743 113,127,137,139,149,151,157,163,167,173,181,191,193,197,199,211,223, %U A216743 229,233,239,241,263,269,271,277,293,311,313,317,331,337,349,353,359,367,373,379,383,389,397,401 %N A216743 Primes p such that x^24 = -2 has no solution mod p. %C A216743 Complement of A051081 relative to A000040. %H A216743 Vincenzo Librandi, <a href="/A216743/b216743.txt">Table of n, a(n) for n = 1..1000</a> %t A216743 ok[p_]:= Reduce[Mod[x^24 + 2, p] == 0, x, Integers] == False; Select[Prime[Range[100]], ok] %Y A216743 Cf. A000040, A051081. %K A216743 nonn,easy %O A216743 1,1 %A A216743 _Vincenzo Librandi_, Sep 15 2012