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 A135612 #2 Mar 30 2012 17:33:53 %S A135612 1,10,1000,100000,100000000000,1000000000000000,100000000000000000, %T A135612 100000000000000000000000000000, %U A135612 100000000000000000000000000000000000000000000000000000000000 %N A135612 Even superperfect numbers divided by 2, written in base 2. %C A135612 Also, concatenation of "1" and A000043(n)-2 digits "0". %C A135612 The number of divisors of a(n) is equal to the number of its digits. This number is equal to A090748(n)=A000043(n)-1. %F A135612 a(n)=A134708(n) written in base 2. %e A135612 a(3)=1000 because A134708(n)=8 and 8 written in base 2 is 1000. %Y A135612 Even superperfect numbers divided by 2: A134708. Cf. A000043, A019279, A090748, A135651, A135656. %K A135612 base,nonn %O A135612 1,2 %A A135612 _Omar E. Pol_, Mar 01 2008