id:A069194 - OEIS Search Results

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Sum_{d|n} n/d*phi(n)/phi(d).

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1, 3, 7, 13, 21, 21, 43, 53, 64, 63, 111, 91, 157, 129, 147, 213, 273, 192, 343, 273, 301, 333, 507, 371, 526, 471, 577, 559, 813, 441, 931, 853, 777, 819, 903, 832, 1333, 1029, 1099, 1113, 1641, 903, 1807, 1443, 1344, 1521, 2163, 1491, 2108, 1578, 1911, 2041 (list; graph; listen)

	OFFSET	`1,2`
	MAPLE	`for i from 1 to 100 do d := divisors(i): a[i] := iphi(i)sum(1/d[j]/phi(d[j]), j=1..nops(d)) od:seq(a[j], j=1..100);`
	CROSSREFS	`Cf. A000010.` `Sequence in context: A022777 A033154 A076950 this_sequence A100531 A032409 A073896` `Adjacent sequences: A069191 A069192 A069193 this_sequence A069195 A069196 A069197`
	KEYWORD	`mult,easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 10 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 03 2003`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

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