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 A144990 #2 Mar 31 2012 10:22:10
%S A144990 4,26,4682,82002255,2424561954109885202,
%T A144990 8351341795640007533371051035402867464,
%U A144990 904293415956370831552801002972875366323201452004310405131925112927056461063
%N A144990 Denominators of an Egyptian fraction for 1/Sqrt[12] = 0.2886751345948...
%t A144990 a = {}; k = N[1/Sqrt[12], 1000]; Do[s = Ceiling[1/k]; AppendTo[a, s]; k = k - 1/s, {n, 1, 10}]; a (*Artur Jasinski*)
%Y A144990 A069139, A006487, A006526, A006525, A006524, A001466, A110820, A117116, A118323, A118324, A118325, A144835, A132480-A132574, A069261, A144984-A145003
%K A144990 frac,nonn
%O A144990 1,1
%A A144990 _Artur Jasinski_, Sep 28 2008