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 A113614 #11 Jul 31 2025 07:35:24 %S A113614 121,131,141,151,161,171,181,191,0,1001,1012,1021,1032,1043,1054,1065, %T A113614 1076,1087,1098,0 %N A113614 Least number whose absolute difference of successive digits gives the n-th palindrome (A002113), or 0 if no such number exists. %C A113614 a(n) = 0 if n begins with 9 and contains odd number of digit. E.g., 919, 92129, etc. Are there other values of n for which a(n) = 0? %C A113614 If n begins with 9 as a digit and contains even number of digits then a(n) is a palindrome. %e A113614 a(99) = 909. %e A113614 a(191) = 1098. 1 - 0 = 1, abs(0 - 9) = 9, 9 - 8 = 1. %e A113614 a(9119) = 90109. %Y A113614 Cf. A002113. %K A113614 base,more,nonn,uned %O A113614 10,1 %A A113614 _Amarnath Murthy_, Nov 09 2005