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Non-primatic permutable numbers: All permutations of the number's digits except the ones resulting in leading zeros are nonprimes.
1

%I #11 Jul 16 2015 22:40:29

%S 1,4,6,8,9,10,12,15,18,20,21,22,24,25,26,27,28,30,33,36,39,40,42,44,

%T 45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,64,65,66,68,69,70,72,75,

%U 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

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

%C 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.

%H Andreas Boe, <a href="/A248010/b248010.txt">Table of n, a(n) for n = 1..10000</a>

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

%Y Absolute composites: A067012, A067013.

%Y Monoprimatic permutable numbers: A245808.

%Y Biprimatic permutable numbers: A246043.

%K nonn,base

%O 1,2

%A _Andreas Boe_, Sep 29 2014