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 A216770 #7 Sep 08 2022 08:46:03
%S A216770 5,7,11,13,23,29,31,37,41,47,53,61,71,79,101,103,109,127,131,149,151,
%T A216770 157,167,173,181,191,197,199,211,223,229,239,251,263,269,271,277,281,
%U A216770 293,311,317,331,349,359,367,373,383,389,397,401,421,431,439,461,463,479
%N A216770 Primes p such that x^50 = -2 has no solution mod p.
%C A216770 Complement of A051094 relative to A000040.
%H A216770 Vincenzo Librandi, <a href="/A216770/b216770.txt">Table of n, a(n) for n = 1..1000</a>
%t A216770 ok[p_] := Reduce[Mod[x^50 + 2, p] == 0, x, Integers] == False;Select[Prime[Range[200]], ok]
%o A216770 (Magma) [p: p in PrimesUpTo(600) | not exists{x : x in ResidueClassRing(p) | x^50 eq -2}];
%Y A216770 Cf. A000040, A051094.
%K A216770 nonn,easy
%O A216770 1,1
%A A216770 _Vincenzo Librandi_, Sep 16 2012