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 A262223 #5 Sep 15 2015 20:08:32 %S A262223 0,2,4,6,8,10,12,14,16,18,11,22,14,16,18,20,22,24,26,28,22,23,44,26, %T A262223 28,30,32,34,36,38,33,34,35,66,38,40,42,44,46,48,44,45,46,47,88,50,52, %U A262223 54,56,58,55,56,57,58,59,110,62,64,66,68,66,67,68,69,70,71 %N A262223 a(n) = n + largest palindrome contained in decimal representation of n. %C A262223 a(n) = n + A047813(n). %H A262223 Reinhard Zumkeller, <a href="/A262223/b262223.txt">Table of n, a(n) for n = 0..10000</a> %o A262223 (Haskell) %o A262223 a262223 n = n + a047813 n %Y A262223 Cf. A047813, A262224 (iteration, start = 1). %K A262223 nonn,base %O A262223 0,2 %A A262223 _Reinhard Zumkeller_, Sep 15 2015