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 A067012 #15 Apr 24 2025 15:14:48
%S A067012 4,6,8,9,12,15,18,21,22,24,25,26,27,28,33,36,39,40,42,44,45,46,48,49,
%T A067012 51,52,54,55,56,57,58,60,62,63,64,65,66,68,69,72,75,77,78,80,81,82,84,
%U A067012 85,86,87,88,90,93,94,96,99,102,105,108,111,114,116,117,120,122,123
%N A067012 Absolute composites: every permutation of digits (dropping any leading zeros) is a composite number.
%H A067012 T. D. Noe, <a href="/A067012/b067012.txt">Table of n, a(n) for n = 1..10000</a>
%e A067012 18 is a term since it is composite and the permutation 81 is composite too.
%t A067012 t={}; Do[l1=Table[FromDigits[k], {k,Permutations[IntegerDigits[n]]}]; If[Select[l1,PrimeQ] == {} && FreeQ[l1,1] == True, AppendTo[t,n]],{n,123}]; t (* _Jayanta Basu_, May 03 2013 *)
%Y A067012 Subsequence of A067013.
%K A067012 base,nonn
%O A067012 1,1
%A A067012 _Lior Manor_, Dec 26 2001