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A211822
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Nonprime numbers with all divisors with additive digital root of 1.
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2
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1, 361, 703, 1369, 1387, 2071, 2413, 2701, 3097, 3439, 3781, 4033, 4699, 5149, 5329, 5833, 6031, 6697, 6859, 7201, 7363, 7543, 7957, 8227, 9253, 9271, 9937, 10027, 10279, 10963, 11359, 11647, 11881, 11899, 11989, 13213, 13357
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Complement of A061237 (prime numbers == 1 (mod 9)) with respect to A211821.
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LINKS
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Table of n, a(n) for n=1..37.
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EXAMPLE
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Number 6859 with divisors 1, 19, 361, 6859 is in sequence because all divisors have additive digital root of 1.
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MATHEMATICA
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(* First run the program for A211821 *) Select[A211821, Not[PrimeQ[#]] &] (* Alonso del Arte, May 02 2012 *)
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CROSSREFS
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Cf. A211821, A024906, A061237, A017173, A211823.
Sequence in context: A137607 A219340 A183997 * A176899 A112078 A206249
Adjacent sequences: A211819 A211820 A211821 * A211823 A211824 A211825
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KEYWORD
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nonn,base
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AUTHOR
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Jaroslav Krizek, Apr 26 2012
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STATUS
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approved
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