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 A241039 #7 Apr 16 2014 04:30:22
%S A241039 1,2047,2049,4196353,4194305,17600780175361,4192257,
%T A241039 73823022692637345793,17592186044417,73786976303428141057,
%U A241039 17583600302081,1298708349570020393652962442872833,17592181850113
%N A241039 Cyclotomic(n,2048).
%C A241039 Are all terms composite? At least the first 10000 terms are.
%H A241039 T. D. Noe, <a href="/A241039/b241039.txt">Table of n, a(n) for n = 0..300</a>
%t A241039 Table[Cyclotomic[k, 2048], {k, 0, 20}]
%Y A241039 Cf. A019320-A019331 (cyclotomic polynomials evaluated at 2..13).
%Y A241039 Cf. A020500-A020513 (cyclotomic polynomials evaluated at 1, -2..-13, -1).
%Y A241039 Cf. A117544 (least k such that cyclotomic(n,k) is prime).
%Y A241039 Cf. A117545 (least k such that cyclotomic(k,n) is prime).
%K A241039 nonn
%O A241039 0,2
%A A241039 _T. D. Noe_, Apr 15 2014