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 A093108 #13 Nov 13 2016 16:55:22 %S A093108 3,9,10,21,27,50,55,68,78,81,147,155,171,243,250,253,301,406,410,605, %T A093108 657,666,729,889,979,1014,1029,1081,1156,1250,1378,1582,1711,1830, %U A093108 1962,2056,2187,2211,2265,2328,2485,2892,3081,3249,3403,4082,4658,4805,4965 %N A093108 Numbers n such that the Zsigmondy number Zs(n,4,1) differs from the n-th cyclotomic polynomial evaluated at 4. %C A093108 A019322(n) does not equal A064080(n). %t A093108 Select[Range[10000], GCD[#, Cyclotomic[#, 4]]!=1 &] (* _Emmanuel Vantieghem_, Nov 13 2016 *) %Y A093108 Cf. A093107, A093106, A093109. %K A093108 nonn %O A093108 1,1 %A A093108 _Ralf Stephan_, Mar 20 2004 %E A093108 More terms from _Vladeta Jovovic_, Apr 02 2004 %E A093108 Definition corrected by _Jerry Metzger_, Nov 04 2009