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 A051078 #21 Sep 08 2022 08:44:59
%S A051078 2,3,11,17,41,43,59,83,89,107,113,131,137,179,227,233,251,257,281,283,
%T A051078 347,353,401,419,443,449,457,467,491,499,521,563,569,587,593,601,617,
%U A051078 641,643,659,683,691,761,809,827,857,881,929,947,953,971,977,1019,1049,1051,1091,1097,1163,1187,1193,1217,1259,1283,1289,1307,1361,1409
%N A051078 Primes p such that x^18 = -2 has a solution mod p.
%C A051078 Differs from A051096 first at the 640th entry, at p=17659, next at p=23059. - _R. J. Mathar_, Oct 14 2008
%C A051078 Complement of A216740 relative to A000040. - _Vincenzo Librandi_, Sep 16 2012
%H A051078 Vincenzo Librandi, <a href="/A051078/b051078.txt">Table of n, a(n) for n = 1..1000</a>
%t A051078 ok[p_]:= Reduce[Mod[x^18 + 2, p] == 0, x, Integers] =!= False; Select[Prime[Range[400]], ok] (* _Vincenzo Librandi_, Sep 15 2012 *)
%o A051078 (PARI) /* see A051071 */
%o A051078 (Magma) [p: p in PrimesUpTo(1410) | exists(t){x : x in ResidueClassRing(p) | x^18 eq - 2}]; // _Vincenzo Librandi_ Sep 15 2012
%K A051078 nonn,easy
%O A051078 1,1
%A A051078 _N. J. A. Sloane_
%E A051078 More terms from _Joerg Arndt_, Jul 27 2011