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A091529
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When sum {k=1 to n} H(k) k! (n-k)! (mod {n+1}) (A091528) is not zero.
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1
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1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 16, 18, 21, 22, 25, 28, 30, 33, 36, 37, 40, 42, 45, 46, 52, 57, 58, 60, 61, 66, 70, 72, 73, 78, 81, 82, 85, 88, 93, 96, 100, 102, 105, 106, 108, 112, 117, 121, 126, 130, 133, 136, 138, 141, 145, 148, 150, 156, 157, 162, 165, 166, 172, 177
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| It is conjectured that the density decreases. In each century the number of members are so far: 41, 30, 26, 28, 23, 24, 24, 21, 24, 22, ...
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MATHEMATICA
| Select[ Range[178], Mod[ Sum[ HarmonicNumber[k] k! (# - k)!, {k, 1, #}], # + 1] ? 0 &] (from Robert G. Wilson v Jan 14 2004)
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CROSSREFS
| Cf. A091528.
Sequence in context: A006594 A172276 A143028 * A184967 A095775 A035063
Adjacent sequences: A091526 A091527 A091528 * A091530 A091531 A091532
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Jan 08 2004
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EXTENSIONS
| Extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 14 2004
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