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 A136744 #4 Mar 30 2012 18:50:59 %S A136744 5,1,3,2,4,10,52,81,205,2089,5258,27053,86885,506248,1999385,15873555, %T A136744 35291389,341118861,1072734242 %N A136744 Smallest m such that A136743(m) = n. %C A136744 A136743(a(n)) = n and A136743(m) <> n for m < a(n). %e A136744 a(6)=10: A136743(10) = A001221(A136742(10)) = A001221(39270) = %e A136744 A001221(2*3*5*7*11*17) = 6. %K A136744 nonn %O A136744 1,1 %A A136744 _Reinhard Zumkeller_, Jan 20 2008 %E A136744 a(10)-a(19) from _Donovan Johnson_, Feb 18 2010