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 A069257 #4 Oct 18 2019 16:36:15
%S A069257 6,20,57960,3145940416080,5765760,
%T A069257 288680192354725622464710969631440008928,
%U A069257 20484953806009937929429725901717124022833778640,59553628273094395440,102119994931499628863688098762720537989600
%N A069257 Denominator of the last term of the Egyptian fraction sum (using the greedy algorithm) which satisfies 1 = 1/n + 1/(n+1) + 1/(n+2) ... 1/a(n).
%C A069257 The next term in the series, a(11), is 7*10^192.
%H A069257 Amiram Eldar, <a href="/A069257/b069257.txt">Table of n, a(n) for n = 2..14</a>
%e A069257 Since 1 = 1/3 + 1/4 + 1/5 + 1/6 + 1/20, a(3) = 20.
%t A069257 a[n_] := Module[{s = 1/n, k = n}, While[s < 1, k = Max[k + 1, Ceiling[1/(1 - s)]]; s += 1/k]; k]; Array[a, 9, 2] (* _Amiram Eldar_, Oct 18 2019 *)
%K A069257 easy,frac,nonn
%O A069257 2,1
%A A069257 Christopher Lund (clund(AT)san.rr.com), Apr 14 2002