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 A031289 #11 Jul 13 2013 12:01:55 %S A031289 2,15,30,32,34,35,36,38,40,42,44,46,48,55,75,95,115,135,155,175,198, %T A031289 228,251,254,257,258,260,263,266,269,272,275,278,288,318,348,378,408, %U A031289 438,468,490,493,496,498,499,502,505,508,511,514 %N A031289 Position of n-th 2 in A007376. %C A031289 A007376(a(n)) = 2. %H A031289 Reinhard Zumkeller, <a href="/A031289/b031289.txt">Table of n, a(n) for n = 1..10000</a> %o A031289 (Haskell) %o A031289 import Data.List (elemIndices) %o A031289 a031289 n = a031289_list !! (n-1) %o A031289 a031289_list = map (+ 1) $ elemIndices 2 a007376_list %o A031289 -- _Reinhard Zumkeller_, Jul 28 2011 %Y A031289 Cf. A193428; A031287, A031288, A031290, A031291, A031292, A031293, A031294, A031295, A031296. %K A031289 nonn,less,base %O A031289 1,1 %A A031289 _Clark Kimberling_