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 A140398 #8 Feb 02 2017 14:01:47 %S A140398 2,5,7,10,13,15,18,23,26,28,31,34,36,39,44,47,49,52,57,60,62,65,68,70, %T A140398 73,78,81,83,86,89,91,94,96,99,102,104,107,112,115,117,120,123,125, %U A140398 128,133,136,138,141,146,149,151,154,157,159,162,167,170,172,175,178,180 %N A140398 Numbers n such that A140397(n) = 0. %t A140398 Select[Range[200],Floor[3*GoldenRatio*#]-3Floor[GoldenRatio*#]==0&] (* _Harvey P. Dale_, Feb 02 2017 *) %K A140398 nonn %O A140398 1,1 %A A140398 _Fred Lunnon_, Jun 20 2008 %E A140398 Extended by _Max Alekseyev_, Apr 11 2009