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 A303504 #18 Oct 08 2018 10:21:32 %S A303504 102,103,104,105,106,107,108,109,120,123,124,125,126,127,128,129,130, %T A303504 132,134,135,136,137,138,139,140,142,143,145,146,147,148,149,150,152, %U A303504 153,154,156,157,158,159,160,162,163,164,165,167,168,169,170,172,173,174,175,176,178,179,180,182,183 %N A303504 Integers whose digits, together with a single supplementary digit, cannot be reordered to form a base-10 palindrome number. %C A303504 This is the complement of A303502. %C A303504 Starts with the 648 terms of A031962. - _Georg Fischer_, Oct 08 2018 %H A303504 Jean-Marc Falcoz, <a href="/A303504/b303504.txt">Table of n, a(n) for n = 1..5184</a> %e A303504 a(1) = 102 together with a single 0 can form 1002, 1020, 1200, 2001, 2010 and 2100, but none of these are palindromes; %e A303504 a(1) = 102 together with a single 1 can form 1012, 1021, 1102, 1120, 1201, 1210, 2011, 2101 and 2110, but none of these are palindromes; %e A303504 etc. %Y A303504 Cf. A002113 (Palindromes in base 10), A303502 (complement of this sequence). %K A303504 nonn,base %O A303504 1,1 %A A303504 _Eric Angelini_ and _Jean-Marc Falcoz_, Apr 25 2018