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 A147523 #6 Mar 30 2012 17:35:01 %S A147523 3,8,37,195,1159,6951,42421,261430,1631123,10238173,64536808 %N A147523 a(n) = number of n-digit terms in A058369. %e A147523 a(1)=3: 0,1,9; a(2)=8: 10,18,19,45,46,55,90,99. %Y A147523 A058369 Numbers n such that n and n^2 have same digit sum. A004159 Sum of digits of n^2. A007953 Digital sum (i.e. sum of digits) of n. %K A147523 base,nonn %O A147523 1,1 %A A147523 _Zak Seidov_, Apr 25 2009 %E A147523 a(9) from _Donovan Johnson_, Dec 08 2009 %E A147523 a(10)-a(11) from _Donovan Johnson_, Jul 31 2011