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 A220987 #7 Dec 29 2012 15:07:34
%S A220987 58367,3812903020530517,107454987376543082369146967,
%T A220987 2808133028073215608147547774721982717,
%U A220987 72885505321551844061773948114862247606146502767,1890579685660625069233746109183146734516524279847333062117
%N A220987 The left Aurifeuillian factor of 11^(22n+11) + 1.
%C A220987 The corresponding right Aurifeuillian factor is A220988.
%H A220987 Wikipedia, <a href="http://en.wikipedia.org/wiki/Cunningham_project">Cunningham Project</a>
%F A220987 a(n) = 161051 z^10 - 161051 z^9 + 73205 z^8 - 14641 z^7 - 1331 z^6 + 1331 z^5 - 121 z^4 - 121 z^3 + 55 z^2 - 11 z + 1 with z = 11^n.
%F A220987 Aurifeuillian factorization: 11^(22n+11) + 1 = (11^(2n+1) + 1) * a(n) * A220988(n).
%t A220987 Table[z = 11^n; 161051 z^10 - 161051 z^9 + 73205 z^8 - 14641 z^7 - 1331 z^6 + 1331 z^5 - 121 z^4 - 121 z^3 + 55 z^2 - 11 z + 1, {n, 0, 10}]
%Y A220987 Cf. A092440, A085601, A220978, A198410, A220979-A220990.
%K A220987 nonn,easy
%O A220987 0,1
%A A220987 _Stuart Clary_, Dec 27 2012