id:A075708 - OEIS Search Results

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Sum of the divisors of 2^n - 1.

+0
2

1, 4, 8, 24, 32, 104, 128, 432, 592, 1536, 2160, 8736, 8192, 22528, 38912, 111456, 131072, 473600, 524288, 1999872, 2466048, 5909760, 8567136, 38054016, 34713728, 89522176, 155493536, 462274560, 539922240, 2015330304, 2147483648 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = sigma(2^n - 1).`
	MATHEMATICA	`Table[DivisorSigma[1, 2^n - 1], {n, 1, 40}]`
	CROSSREFS	`Sequence in context: A075688 A026596 A083504 this_sequence A066617 A024589 A062015` `Adjacent sequences: A075705 A075706 A075707 this_sequence A075709 A075710 A075711`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 03 2002`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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