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 A185961 #17 Jan 25 2014 01:43:46 %S A185961 2,6,12,28,40,48,224,234,496,960,8128,47616,174592,10371840,15037440, %T A185961 28090368,33550336,134209536,207516672,492101632,1150402560, %U A185961 8589869056,59205411720,137438691328 %N A185961 Let d_1=1 < d_2 < d_3 < ... be the divisors of n; sequence lists positive numbers n such that for some k, n = 2(d_1 + ... + d_k). %D A185961 Arie Groeneveld, Posting to Sequence Fans Mailing List, Feb 06, 2011 %o A185961 (PARI) forstep(n=2, 33550336, 2, d=divisors(n); s=0; for(j=1, numdiv(n), s=s+2*d[j]; if(s>=n, if(s==n, print1(n ", ")); next(2)))) \\ _Donovan Johnson_, Jan 24 2014 %Y A185961 Supersequence of A000396. %Y A185961 Cf. A064510, A185584, A185960. %K A185961 nonn,more %O A185961 1,1 %A A185961 _N. J. A. Sloane_, Feb 07 2011 %E A185961 a(14)-a(22) from _Donovan Johnson_, Feb 10 2011 %E A185961 a(23)-a(24) from _Donovan Johnson_, Jan 24 2014