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 A140400 #8 Jul 08 2019 02:00:58 %S A140400 3,6,8,11,16,19,21,24,27,29,32,37,40,42,45,50,53,55,58,61,63,66,71,74, %T A140400 76,79,82,84,87,92,95,97,100,105,108,110,113,116,118,121,126,129,131, %U A140400 134,137,139,142,144,147,150,152,155,160,163,165,168,171,173,176 %N A140400 Numbers n such that A140397(n) = 2. %Y A140400 Cf. A140397, A140398, A140399. %K A140400 nonn %O A140400 1,1 %A A140400 _Fred Lunnon_, Jun 20 2008 %E A140400 More terms from _Rémy Sigrist_, Jul 08 2019