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 A045644 #13 Jul 07 2025 10:44:23 %S A045644 0,9,99,171,252,333,414,585,666,747,828,909,999,1881,2772,3663,4554, %T A045644 5445,6336,7227,8118,9009,9999,10701,11511,12321,13131,14841,15651, %U A045644 16461,17271,18081,18981,19791,20502,21312,22122,23832,24642,25452,26262 %N A045644 Palindromic and divisible by 9. %H A045644 Harvey P. Dale, <a href="/A045644/b045644.txt">Table of n, a(n) for n = 1..1001</a> %t A045644 Select[9*Range[0,3000],PalindromeQ] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Mar 30 2020 *) %Y A045644 Intersection of A002113 and A008591. %Y A045644 Cf. A029951, A045638, A045639, A043040, A043041, A045642, A045643, A083852. %K A045644 nonn,base %O A045644 1,2 %A A045644 _Jeff Burch_ %E A045644 Edited to include a(1) = 0 by _Paolo Xausa_, Jul 07 2025