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 A136497 #2 Mar 30 2012 18:57:10 %S A136497 1,3,4,5,6,8,10,12,13,15,16,17,18,19,21,22,23,24,26,27,28,30,32,33,34, %T A136497 35,37,39,41,43,44,46,47,48,50,51,53,54,56,58,59,60,62,63,65,66,68,69, %U A136497 70,71,72,74,75,76,77,79,81,83,84,86,87,88,89,91,92,93,94,96,97,98,99 %N A136497 Solution of the complementary equation b(n)=a(a(n))+a(n). %D A136497 Clark Kimberling, "Complementary Equations," Journal of Integer Sequences 10 (2007) Article 07.1.4, 1-14. %e A136497 b(1) = a(a(1))+a(1) = 1+1 = 2; %e A136497 b(2) = a(a(2))+a(2) = 4+3 = 7; %e A136497 b(3) = a(a(3))+a(3) = 5+4 = 9. %Y A136497 Cf. A136498. %K A136497 nonn %O A136497 1,2 %A A136497 _Clark Kimberling_, Jan 01 2008