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 A175082 #2 Mar 30 2012 19:00:23 %S A175082 1,2,3,5,6,7,10,11,12,13,14,15,17,18,19,20,21,22,23,24,26,28,29,30,31, %T A175082 33,34,35,37,38,39,40,41,42,43,44,45,46,47,48,50,51,52,53,54,55,56,57, %U A175082 58,59,60,61,62,63,65,66,67,68,69,70,71,72,73,74,75 %N A175082 Possible values for sum of perfect divisors of n. %C A175082 Perfect divisor of n is divisor d such that d^k = n for some k >= 1. See A175067 (sum of perfect divisors of n) and A175081 (values taken by the sum of perfect divisors of n (A175067) sorted into ascending order). %C A175082 Complement of A001597(n+1) for n >= 1 (perfect powers >= 4). a(n) = A007916(n-1) for n >= 2. [From _Jaroslav Krizek_, Jan 30 2010] %K A175082 nonn %O A175082 1,2 %A A175082 _Jaroslav Krizek_, Jan 24 2010