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A112409
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Table read by rows: for each n: the orders of the permutations of n elements, excluding those that are a divisor of the order of another permutation of n elements.
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1, 2, 2, 3, 3, 4, 4, 5, 6, 4, 5, 6, 7, 10, 12, 8, 10, 12, 15, 8, 9, 12, 14, 15, 20, 8, 9, 12, 14, 20, 21, 30
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 1: 1, 2: 2, 3: 2 3, 4: 3 4, 5: 4 5 6, 6: 4 5 6, 7: 7 10 12...
Permutations of 7 elements have orders of 1, 2, 3, 4, 5, 6, 7, 10, 12, of which 7, 10 and 12 are not factors of any others.
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CROSSREFS
| Cf. A000793.
Sequence in context: A029030 A008719 A079685 * A026261 A026233 A147954
Adjacent sequences: A112406 A112407 A112408 * A112410 A112411 A112412
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KEYWORD
| easy,nonn,tabf
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AUTHOR
| Allen Tracht (atracht(AT)ix.netcom.com), Dec 08 2005
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