The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A112409 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

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.
(history; published version)

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

EXAMPLE

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.

KEYWORD

easy,nonn,tabf,new

#2 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

NAME

Table read by rows: for each n: the orders of the permutations of n elements, excluding those that are a factor divisor of the order of another permutation of n elements.

KEYWORD

easy,nonn,tabf,new

#1 by N. J. A. Sloane at Tue Jan 24 03:00:00 EST 2006

NAME

Table read by rows: for each n: the orders of the permutations of n elements, excluding those that are a factor of the order of another permutation of n elements.

DATA

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.

KEYWORD

easy,nonn,tabf

AUTHOR

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

STATUS

approved