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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

%I

%S 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,

%T 20,21,30

%N 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.

%e 1: 1, 2: 2, 3: 2 3, 4: 3 4, 5: 4 5 6, 6: 4 5 6, 7: 7 10 12...

%e 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.

%Y Cf. A000793.

%K easy,nonn,tabf

%O 1,2

%A Allen Tracht (atracht(AT)ix.netcom.com), Dec 08 2005

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)