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 A104444 #20 Feb 16 2025 08:32:56 %S A104444 1020,1029,1031,1038,1041,1047,1051,1061,1065,1071,1074,1081,1091, %T A104444 1101,1130,1131,1139,1141,1148,1151,1157,1161,1171,1175,1181,1191, %U A104444 1201,1231,1240,1241,1249,1251,1258,1261,1267,1271,1281,1291,1301,1314,1341,1350 %N A104444 Not the difference of two palindromes (where 0 is considered a palindrome). %H A104444 David W. Wilson, <a href="/A104444/b104444.txt">Table of n, a(n) for n = 1..10000</a> %H A104444 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PalindromicNumber.html">Palindromic Number</a> %F A104444 A084843 \ A002113 (conjecture). [_R. J. Mathar_, Jul 23 2009] %Y A104444 Cf. A002113, A035137, A084843. %K A104444 base,nonn %O A104444 1,1 %A A104444 _David W. Wilson_, Mar 07 2005