id:A133067 - OEIS Search Results

Search: id:A133067

Displaying 1-1 of 1 results found.

page 1

Perfect numbers divided by 2, minus 1.

+0
1

2, 13, 247, 4063, 16775167, 4294934527, 68719345663, 1152921504069976063, 1329227995784915872327346307976921087, 95780971304118053647396689042151819065498660774084607 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=(A000396(n)/2)-1.`
	EXAMPLE	`a(3)=247 because the 3rd perfect numbers is 496 and 496/2 is 248. a(3)=248-1.`
	CROSSREFS	`Cf. A000396, A133028.` `Sequence in context: A015196 A113098 A135870 this_sequence A042677 A134296 A086510` `Adjacent sequences: A133064 A133065 A133066 this_sequence A133068 A133069 A133070`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Nov 07 2007`

page 1

Search completed in 0.002 seconds

Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research