id:A134706 - OEIS Search Results

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a(n) = n-th perfect number divided by 2^n, minus 1.

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2, 6, 61, 507, 1048447, 134216703, 1073739775, 9007199250546687, 5192296858534827626278696515534847, 187072209578355573530071658285452771612302071824383 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=(A000396(n)/(2^n)) - 1.` `a(n) = A134705(n)-1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 30 2008`
	EXAMPLE	`a(3)=61 because the 3rd perfect number is 496 and 2^3=8 and (496/8)-1=61.`
	CROSSREFS	`Cf. A000396, A133028.` `Sequence in context: A077175 A139771 A129665 this_sequence A030170 A082640 A139695` `Adjacent sequences: A134703 A134704 A134705 this_sequence A134707 A134708 A134709`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Nov 07 2007`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 30 2008`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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