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 A071566 #11 Aug 22 2021 00:14:04 %S A071566 2,12,16,22,28,30,40,46,58,66,70,72,100,102,108,148,162,172,178,196, %T A071566 222,232,250,276,280,292,330,366,372,382,418,442,460,462,466,486,498, %U A071566 556,568,586,592,598,600,612,618,642,646,672,676,682,700,718,760,768 %N A071566 Numbers k such that x^k + x^(k-1) + x^(k-2) + ... + x + 1 is irreducible over GF(11). %F A071566 a(n) = A019339(n+1) - 1. - _Ralf Stephan_, Dec 26 2004 %Y A071566 Cf. A071642. %K A071566 easy,nonn %O A071566 1,1 %A A071566 _Robert G. Wilson v_, Jun 22 2002