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 A168231 #2 Mar 30 2012 17:26:30 %S A168231 2,3,2,4,4,4,4,4,5,2,4,5,4,4,5,5,4,4,4,5,5,5,5,4,5,4,5,5,5,4,4,5,4,5, %T A168231 5,5,5,5,4,5,5,5,5,4,5,5,5,5,5,4,4,5,5,5,5,5,4,5,5,4,4,5,5,5,5,7,5,4, %U A168231 5,5,5,5,4,4,5,5,5,5,5,5,5,5,7,5,5,7,5,5,7,5,5,5,7,4,5,5,5,5,5,5,5,5,5,5,5 %N A168231 a(n)^2 = digital sum of (A076503(n))^2. %C A168231 a(n)^2 = A007953((A076503(n))^2). %Y A168231 Cf. A076503 Prime numbers whose squares have square digital sums, A061910 Numbers n such that sum of digits of n^2 is a square, A007953 Digital sum (i.e. sum of digits) of n, A000040 The prime numbers. %K A168231 base,nonn %O A168231 1,1 %A A168231 _Zak Seidov_, Nov 21 2009