id:A119746 - OEIS Search Results

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A119746

Sum of previous term and preceding relatively prime terms.

+0
1

1, 2, 3, 6, 7, 19, 38, 49, 118, 197, 440, 716, 992, 1268, 1544, 1820, 2040, 2313, 9524, 12113, 33210, 45596, 60298, 74944, 89646, 102032, 116678, 129067, 684624, 826077, 1219334, 2189180, 2203807, 7807703, 15615406, 18789059, 50019871, 100039302 (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, gcd(a(n),a(k))=1} a(k).`
	CROSSREFS	`Cf. A120610.` `Sequence in context: A064292 A079663 A064622 this_sequence A023785 A050581 A073317` `Adjacent sequences: A119743 A119744 A119745 this_sequence A119747 A119748 A119749`
	KEYWORD	`nonn`
	AUTHOR	`Frank Adams-Watters (FrankTAW(AT)Netscape.net), Jun 16 2006`

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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.

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