id:A062949 - OEIS Search Results

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Multiplicative with a(p^e) = ((e+1)*p^(e+1)-(e+2)*p^e+1)/(p-1).

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1, 3, 5, 9, 9, 15, 13, 25, 23, 27, 21, 45, 25, 39, 45, 65, 33, 69, 37, 81, 65, 63, 45, 125, 69, 75, 95, 117, 57, 135, 61, 161, 105, 99, 117, 207, 73, 111, 125, 225, 81, 195, 85, 189, 207, 135, 93, 325, 139, 207, 165, 225, 105, 285, 189, 325, 185, 171, 117, 405 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = Sum_{d\|n} phi(d)tau(d). a(n) = Sum_{k=1..n} tau(n/gcd(n, k)).` `a(n) = Sum_{d\|n} duphi(n/d), where uphi() = A047994(). - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 16 2004`
	CROSSREFS	`Cf. A057660, A029939.` `Sequence in context: A160173 A092996 A141264 this_sequence A166651 A081500 A030365` `Adjacent sequences: A062946 A062947 A062948 this_sequence A062950 A062951 A062952`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 21 2001`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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