id:A120610 - OEIS Search Results

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A120610

Sum of previous term and preceding non-divisors.

+0
3

2, 3, 5, 10, 13, 33, 63, 126, 187, 442, 869, 1753, 3506, 5257, 12269, 24538, 36805, 85876, 171755, 343507, 687019, 1374038, 2061055, 4809126, 9618252, 14427378, 28854567, 62518388, 125036840, 250073665, 500147342, 1000294687, 2000589376 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(1) = 2, a(2) = 3, for n>=2, a(n+1) = a(n) + sum_{1<=k<n, a(k) does not divide a(n)} a(k).`
	CROSSREFS	`Cf. A120611.` `Sequence in context: A103746 A071848 A120938 this_sequence A090859 A004681 A044953` `Adjacent sequences: A120607 A120608 A120609 this_sequence A120611 A120612 A120613`
	KEYWORD	`nonn`
	AUTHOR	`Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 16 2006`

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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

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