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 A381225 #10 Feb 23 2025 09:02:58 %S A381225 1,2,3,4,5,6,7,8,9,91,101,12,22,32,42,52,62,72,82,92,201,13,23,33,43, %T A381225 53,63,73,83,93,301,14,24,34,44,54,64,74,84,94,401,15,25,35,45,55,65, %U A381225 75,85,95,501,16,26,36,46,56,66,76,86,96,601,17,27,37,47,57,67,77,87,97,701,18,28,38,48,58,68,78,88,98,801,19,29,39 %N A381225 Index of first occurrence of n in A290148. %C A381225 Every number >= 0 appears in A290148, and in fact a(n) <= 10*n+1. %H A381225 N. J. A. Sloane, <a href="/A381225/b381225.txt">Table of n, a(n) for n = 0..1999</a> %Y A381225 f. A290148. %K A381225 nonn,base,look %O A381225 0,2 %A A381225 _N. J. A. Sloane_, Feb 23 2025