id:A120611 - OEIS Search Results

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A120611

Sum of previous term and preceding divisors.

+0
2

1, 2, 3, 4, 7, 8, 15, 19, 20, 27, 31, 32, 47, 48, 66, 72, 90, 111, 115, 116, 123, 127, 128, 175, 183, 187, 188, 242, 245, 253, 254, 384, 610, 613, 614, 617, 618, 624, 690, 826, 836, 862, 865, 866, 869, 870, 891, 922, 925, 926, 929, 930, 982, 985, 986, 989, 990 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(1) = 1, a(2) = 2, for n>=2, a(n+1) = a(n) + sum_{1<=k<n, a(k) divides a(n)} a(k).`
	CROSSREFS	`Cf. A120610, A007497.` `Sequence in context: A113050 A097110 A116961 this_sequence A092063 A126850 A007497` `Adjacent sequences: A120608 A120609 A120610 this_sequence A120612 A120613 A120614`
	KEYWORD	`nonn`
	AUTHOR	`Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 16 2006`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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