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 A214653 #6 Jul 13 2013 12:04:29 %S A214653 0,1,2,3,4,5,11,12,13,14,20,21,22,23,24,25,27,29,30,31,32,34,36,38,43, %T A214653 44,45,46,49,50,51,54,62,63,64,66,67,69,70,71,73,74,76,77,78,79,80,81, %U A214653 83,85,86,87,88,89,90,92,94,95,96,99,101,103,105,107,108 %N A214653 Where A214551(n) and A214551(n+2) are coprime. %C A214653 A214323(a(n)) = 1. %H A214653 Reinhard Zumkeller, <a href="/A214653/b214653.txt">Table of n, a(n) for n = 1..10000</a> %o A214653 (Haskell) %o A214653 import Data.List (elemIndices) %o A214653 a214653 n = a214653_list !! (n-1) %o A214653 a214653_list = elemIndices 1 a214323_list %K A214653 nonn %O A214653 1,3 %A A214653 _Reinhard Zumkeller_, Jul 24 2012