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 A092428 #6 Mar 30 2012 18:39:22 %S A092428 4,10,12,13,28,30,31,36,37,39,40,82,84,85,90,91,93,94,108,109,111,112, %T A092428 117,118,120,121,244,246,247,252,253,255,256,270,271,273,274,279,280, %U A092428 282,283,324,325,327,328,333,334,336,337,351,352,354,355,360,361,363 %N A092428 Numbers n such that A092255(n) == 2 (mod 3). %F A092428 A092255(n) == 2 (mod 3) iff n is not a power of 3 or n is not in A074940 %o A092428 (PARI) for(n=1,775,if(binomial(2*n,n)%3*abs(gcd(3^50,n)-n)>0,print1(n,","))) %K A092428 nonn %O A092428 1,1 %A A092428 _Benoit Cloitre_, Mar 22 2004