id:A074371 - OEIS Search Results

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Sigmabonacci numbers: a(n)=a(n-1)+Sigma(a(n-2)). Sigma(n)=Sum of divisors of n.

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1, 1, 2, 3, 6, 10, 22, 40, 76, 166, 306, 558, 1260, 2508, 6876, 13596, 31068, 66012, 144636, 298692, 656532, 1411650, 3114050, 6907892, 12800744 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`a(9)=76=a(8)+Sigma(a(7))=40+(2+1)(11+1)=40+36 because 22=211. a(9)=76=a(8)+Sigma(a(7))=40+(1+2+11+22) =40+36=76.`
	CROSSREFS	`Sequence in context: A127076 A137208 A049527 this_sequence A032202 A125702 A052817` `Adjacent sequences: A074368 A074369 A074370 this_sequence A074372 A074373 A074374`
	KEYWORD	`easy,nonn`
	AUTHOR	`Miklos Kristof (kristmikl(AT)freemail.hu), Sep 24 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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