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 A217252 #17 Nov 19 2019 06:00:53
%S A217252 13,15,31,37,51,73,115,133,163,169,189,193,195,327,331,339,361,385,
%T A217252 391,399,511,529,537,579,583,591,723,729,735,739,925,927,933,937,961,
%U A217252 975,981,993
%N A217252 Lucky numbers whose digital reversal is another lucky number.
%C A217252 Inspired by the error in A140291 (forgotten palindromes 33 and 99), pointed out by _L. Edson Jeffery_ in a post to the SeqFan list.
%C A217252 This sequence is obtained from A118561 by removal of the palindromes A031161 = (1, 3, 7, 9, 33, 99, 111, 141, 151, 171, 303, 393, 535, 717, 727, 777, 787, 979, ...)
%C A217252 By analogy with the "emirps" A006567 and "emirpimes" A097393, these might be called "ykcul"s, for lucky numbers which, when reversed, are different lucky numbers.
%H A217252 Amiram Eldar, <a href="/A217252/b217252.txt">Table of n, a(n) for n = 1..10000</a>
%F A217252 A217252 = A118561 \ A031161 = A118561 \ A002113 = A118561 intersect A029742 = { n in A000959 | R(n) is in A000959 and different from n }, where R = A004086.
%Y A217252 Cf. A000959, A002385, A006567, A097393, A029742, A031161, A002113, A118561, A140291.
%K A217252 base,nonn
%O A217252 1,1
%A A217252 _M. F. Hasler_, Mar 16 2013