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 A056235 #3 Mar 30 2012 18:51:27 %S A056235 7,2047,402653183,1180591620717411303423, %T A056235 233840261972944466912589573234605283144949206876159 %N A056235 n*2^(n*2^n+n)-1. %C A056235 For n>2, a(n) is base at which zero is reached for the function "write f(j) in base j, read as base j+1 and then subtract 1 to give f(j+1)" starting from f(n)=2n^2-1. %F A056235 a(n) =A003261(A036289(n)) =A036289(n)*A001146(n)^n-1 %e A056235 a(3)=3*2^(3*2^3+3)-1=3*2^27-1=402653184-1=402653183 %K A056235 nonn %O A056235 1,1 %A A056235 _Henry Bottomley_, Aug 06 2000