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 A227194 #5 Jul 11 2013 04:19:31
%S A227194 1,2,3,4,6,7,9,10,11,12,14,15,16,23,24,25,26,27,30,31,34,35,36,38,39,
%T A227194 42,44,47,48,49,54,55,56,58,59,62,63,64,66,71,74,75,76,79,81,82,83,86,
%U A227194 87,94,95,96,100,103,106,108,110,111,114,119,120,121,130,131
%N A227194 Natural numbers for which all sums Sum_{i=1..u} K(i/n) (with u ranging from 1 to n) are nonnegative, where K(i/n) is Kronecker symbol of i and n.
%o A227194 (PARI) firstdiving(n) = {s=0;for(k=1,n,s=s+kronecker(k,n);if(s<0,return(k)));return(0)}
%o A227194 for(n=1,500,if((0==firstdiving(n)),print1(n,", ")))
%Y A227194 Subsets: A095100, A095102 (gives the prime terms). Cf. A227196-A227198.
%K A227194 nonn
%O A227194 1,2
%A A227194 _Antti Karttunen_, Jul 06 2013