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 A127812 #7 Nov 17 2012 15:51:03 %S A127812 4,1,2,3,21,5,15,7,33,22,66,11,77,13,39,26,57,17,51,19,69,46,95,23, %T A127812 145,465,155,435,93,29,87,31,185,777,259,555,222,37,111,74,129,41,123, %U A127812 43,141,94,215,47,265,1113,371,795,318,53,159,106,177,118,354,59,366,61 %N A127812 Smallest m such that A072594(m) = n. %C A127812 A072594(a(n)) = n and A072594(m) <> n for m < a(n). %H A127812 R. Zumkeller, <a href="/A127812/b127812.txt">Table of n, a(n) for n = 0..1000</a> %o A127812 (Haskell) %o A127812 import Data.List (elemIndex) %o A127812 import Data.Maybe (fromJust) %o A127812 a127812 = (+ 1) . fromJust . (`elemIndex` a072594_list) %o A127812 -- _Reinhard Zumkeller_, Nov 17 2012 %K A127812 nonn %O A127812 0,1 %A A127812 _Reinhard Zumkeller_, Feb 02 2007