id:A099050 - OEIS Search Results

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a(1)=1; for n>=2, a(n)=sum(1<=i<=j<=n-1, gcd(a(i),a(j))).

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1, 1, 3, 8, 19, 42, 92, 194, 398, 808, 1638, 3334, 6686, 13392, 26842, 53708, 107450, 214952, 430148, 860340, 1720826, 3441688, 6883446, 13766950, 27533998, 55068040, 110136196, 220272460, 440545040, 881090532, 1762181454, 3524362990 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) is asymptotic to c*2^n where c=0.8205797305404015389561...`
	CROSSREFS	`Sequence in context: A002318 A095681 A079583 this_sequence A065352 A161993 A008466` `Adjacent sequences: A099047 A099048 A099049 this_sequence A099051 A099052 A099053`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 13 2004`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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