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A112409
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.
0
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
OFFSET
1,2
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.
CROSSREFS
Cf. A000793.
Sequence in context: A029030 A008719 A079685 * A256991 A267110 A026261
KEYWORD
easy,nonn,tabf
AUTHOR
Allen Tracht (atracht(AT)ix.netcom.com), Dec 08 2005
STATUS
approved