id:A034738 - OEIS Search Results

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Dirichlet convolution of b_n=2^(n-1) with phi(n).

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1, 3, 6, 12, 20, 42, 70, 144, 270, 540, 1034, 2112, 4108, 8274, 16440, 32928, 65552, 131418, 262162, 524880, 1048740, 2098206, 4194326, 8391024, 16777300, 33558564, 67109418, 134226120, 268435484, 536888520, 1073741854, 2147516736 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Sum of GCD's of parts in all compositions of n. - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 13 2003`
	FORMULA	`(1/2)* Sum_{d\|n} phi(d)*2^(n/d), n >= 1.`
	CROSSREFS	`Equals A053635 / 2. Cf. A000740.` `Cf. A078392.` `Sequence in context: A038577 A028925 A028924 this_sequence A054064 A053479 A070333` `Adjacent sequences: A034735 A034736 A034737 this_sequence A034739 A034740 A034741`
	KEYWORD	`nonn`
	AUTHOR	`Erich Friedman (erich.friedman(AT)stetson.edu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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