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 A040106 #11 Jul 08 2025 22:47:45
%S A040106 3,7,13,17,23,29,37,41,43,47,53,61,67,73,83,89,97,103,107,113,127,137,
%T A040106 157,163,167,173,193,197,223,227,229,233,241,257,263,277,281,283,293,
%U A040106 307,313,317,337,347,349,353,367
%N A040106 Primes p such that x^4 = 5 has no solution mod p.
%C A040106 Complement of A040105 relative to A000040. - _Vincenzo Librandi_, Sep 17 2012
%H A040106 Vincenzo Librandi, <a href="/A040106/b040106.txt">Table of n, a(n) for n = 1..1000</a>
%t A040106 ok[p_]:= Reduce[Mod[x^4 - 5, p] == 0, x, Integers] == False;Select[Prime[Range[100]], ok] (* _Vincenzo Librandi_, Sep 17 2012 *)
%o A040106 (Magma) [p: p in PrimesUpTo(500) | not exists{x : x in ResidueClassRing(p) | x^4 eq 5} ]; // _Vincenzo Librandi_, Sep 17 2012
%K A040106 nonn,easy
%O A040106 1,1
%A A040106 _N. J. A. Sloane_