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

1,2

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.

Links

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

Example

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

Crossrefs

Absolute composites: A067012, A067013.

Monoprimatic permutable numbers: A245808.

Biprimatic permutable numbers: A246043.

Sequence in context: A066071 A306307 A355170 * A067013 A141607 A071070

Adjacent sequences: A248007 A248008 A248009 * A248011 A248012 A248013

Keyword

nonn,base

Author

Andreas Boe, Sep 29 2014

Status

approved