id:A055515 - OEIS Search Results

Search: id:A055515

Displaying 1-1 of 1 results found.

page 1

(2^n -1)/product(2^p -1) where the product is over all distinct primes p that divide n.

+0
1

1, 1, 1, 5, 1, 3, 1, 85, 73, 11, 1, 195, 1, 43, 151, 21845, 1, 12483, 1, 11275, 2359, 683, 1, 798915, 1082401, 2731, 19173961, 704555, 1, 1649373, 1, 1431655765, 599479, 43691, 8727391, 3272356035, 1, 174763, 9588151, 11822705675, 1, 1649061309, 1 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`a(12) = (2^12 -1)/((2^2 -1) (2^3 -1)) = 195`
	CROSSREFS	`Sequence in context: A121267 A111740 A115638 this_sequence A136744 A068237 A083345` `Adjacent sequences: A055512 A055513 A055514 this_sequence A055516 A055517 A055518`
	KEYWORD	`easy,nonn`
	AUTHOR	`Leroy Quet (qq-quet(AT)mindspring.com), Jul 03 2000`

page 1

Search completed in 0.002 seconds

Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research