

A067012


Absolute composites: every permutation of digits (dropping any leading zeros) is a composite number.


4



4, 6, 8, 9, 12, 15, 18, 21, 22, 24, 25, 26, 27, 28, 33, 36, 39, 40, 42, 44, 45, 46, 48, 49, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 72, 75, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 93, 94, 96, 99, 102, 105, 108, 111, 114, 116, 117, 120, 122, 123
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OFFSET

1,1


LINKS

T. D. Noe, Table of n, a(n) for n = 1..10000


EXAMPLE

18 is a term since it is composite and the permutation 81 is composite too.


MATHEMATICA

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 *)


CROSSREFS

Cf. A067013.
Sequence in context: A161576 A100425 A130074 * A157942 A122786 A092630
Adjacent sequences: A067009 A067010 A067011 * A067013 A067014 A067015


KEYWORD

base,nonn


AUTHOR

Lior Manor Dec 26 2001


STATUS

approved



