id:A153824 - OEIS Search Results

Search: id:A153824

Displaying 1-1 of 1 results found.

page 1

Sum of proper divisors of n!: a(n) = sigma(n!) - n!.

+0
2

0, 0, 1, 6, 36, 240, 1698, 14304, 118800, 1118160, 11705288, 144092256, 1738439808, 24817158912, 355309325280, 5378578601760, 86081749397280, 1570394279039040, 28281459220193088, 572031558109589760, 11458497230555094720 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`a(n) is the sum of proper divisors of factorial number A000142(n).`
	FORMULA	`a(n) = A000203(n!) - n! = A062569(n)-A000142(n) = A001065(A000142(n)).`
	MAPLE	`with(numtheory): seq(sigma(factorial(n))-factorial(n), n = 0 .. 22); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 07 2009]`
	CROSSREFS	`Cf. A000142, A000203, A001065, A062569.` `Sequence in context: A099252 A057395 A066053 this_sequence A001286 A049431 A049428` `Adjacent sequences: A153821 A153822 A153823 this_sequence A153825 A153826 A153827`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Jan 02 2009`
	EXTENSIONS	`Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 07 2009`

page 1

Search completed in 0.002 seconds

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research