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 A083826 #10 Jan 04 2024 01:51:51
%S A083826 12,13,14,15,16,17,18,19,90,0,100,103,104,105,106,107,108,109,900,0,
%T A083826 1000
%N A083826 Smallest k such that k+ 9*(A000042(n-1)*{n, mod 10) is digit reversal of k. A000042(n) = (10^n-1)/9.,a(10n) = 0.
%e A083826 a(13) = 104, 104 + 9*11*(13 mod 10) = 104 + 9*11*3 = 104 + 297 = 401.
%K A083826 base,easy,nonn,uned
%O A083826 1,1
%A A083826 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 09 2003