A248010 Non-primatic permutable numbers: All permutations of the number's digits except the ones resulting in leading zeros are nonprimes.

1, 4, 6, 8, 9, 10, 12, 15, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 33, 36, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 75, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 93, 94, 96, 99, 100, 102, 105, 108, 111, 114, 116, 117, 120, 122, 123, 126, 129, 132, 135, 138, 141, 144, 147

Offset: 1

Author

Andreas Boe, Sep 29 2014

Keywords

• nonn
• base

Comments

This sequence differs slightly from "absolute composite numbers". 30 is not an absolute composite since 03 is counted as a prime, but in this sequence permutations with leading zeros are disqualified as viable permutations.

Examples

			7000 qualifies since it is a composite and the only allowed permutation of its four digits.
		

Links

• Andreas Boe, Table of n, a(n) for n = 1..10000

Crossrefs

Absolute composites: A067012, A067013.

Monoprimatic permutable numbers: A245808.

Biprimatic permutable numbers: A246043.