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 A091897 #2 Mar 30 2012 17:36:41
%S A091897 2,3,4,5,6,7,8,9,11,12,13,15,17,18,21,22,24,25,26,27,28,31,33,36,37,
%T A091897 39,40,42,44,45,46,48,49,51,52,54,55,56,57,58,60,62,63,64,65,66,68,69,
%U A091897 71,72,73,75,77,78,79,80,81,82,84,85,86,87,88,90,93,94,96,97,99,102,105
%N A091897 Numbers that remain prime or composite for all permutations of their digits.
%C A091897 Union of A003459 and A067012. The repdigit numbers (A010785) > 1 are also clearly a subsequence.
%Y A091897 Cf. A003459 (absolute primes), A067012 ('absolute composites'), A091898 (complement of A091897), A010785 (repdigit numbers).
%K A091897 base,nonn
%O A091897 1,1
%A A091897 _Rick L. Shepherd_, Feb 09 2004