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 A200087 #8 Jul 13 2013 12:04:19 %S A200087 1,2,53,5,71,26,9,8,19,72,149,27,91,18,21,17,43,20,29,50,35,150,45,28, %T A200087 99,92,773,34,171,42,33,32,123,44,49,41,75227,58,137,51,295,48,789,68, %U A200087 47,46,65,57,891,100,269,90,111,428,921,64,131,172,105,203 %N A200087 Smallest number m such that A079878(m) = n. %C A200087 A079878(a(n)) = n and A079878(m) <> n for m < a(n). %H A200087 Reinhard Zumkeller, <a href="/A200087/b200087.txt">Table of n, a(n) for n = 1..860</a> %o A200087 (Haskell) %o A200087 import Data.List (elemIndex) %o A200087 import Data.Maybe (fromJust) %o A200087 a200087 n = (fromJust $ elemIndex n a079878_list) + 1 %K A200087 nonn %O A200087 1,2 %A A200087 _Reinhard Zumkeller_, Nov 13 2011