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 A248249 #6 Oct 20 2019 20:23:11
%S A248249 4,2,13,177,344766,1649432522483,3009384963228815398356405,
%T A248249 9085726642856091334926418336934724393317743509110,
%U A248249 200625769243543756748406312378876010708020812606355642597458369416042779347013395136132184521789202
%N A248249 Egyptian fraction representation of sqrt(21) (A010477) using a greedy function.
%t A248249 Egyptian[nbr_] := Block[{lst = {IntegerPart[nbr]}, cons = N[ FractionalPart[ nbr], 2^20], denom, iter = 8}, While[ iter > 0, denom = Ceiling[ 1/cons]; AppendTo[ lst, denom]; cons -= 1/denom; iter--]; lst]; Egyptian[ Sqrt[ 21]]
%Y A248249 Egyptian fraction representations of the square roots: A006487, A224231, A248235-A248322.
%Y A248249 Egyptian fraction representations of the cube roots: A129702, A132480-A132574.
%K A248249 nonn
%O A248249 0,1
%A A248249 _Robert G. Wilson v_, Oct 04 2014