id:A064971 - OEIS Search Results

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n*usigma(n), where usigma(n) is the sum of unitary divisors of n (A034448).

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1, 6, 12, 20, 30, 72, 56, 72, 90, 180, 132, 240, 182, 336, 360, 272, 306, 540, 380, 600, 672, 792, 552, 864, 650, 1092, 756, 1120, 870, 2160, 992, 1056, 1584, 1836, 1680, 1800, 1406, 2280, 2184, 2160, 1722, 4032, 1892, 2640, 2700, 3312, 2256 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Multiplicative with a(p^e) = p^e*(p^e+1). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 01 2001`
	MAPLE	`seq(mul(ifactors(n)[2][i][1]^ifactors(n)[2][i][2]*(1+ifactors(n)[2][i][1]^ifactors(n)[2][i][2]), i=1..nops(ifactors(n)[2])), n=1..50);`
	CROSSREFS	`Adjacent sequences: A064968 A064969 A064970 this_sequence A064972 A064973 A064974` `Sequence in context: A116368 A007622 A056930 this_sequence A130199 A117343 A028611`
	KEYWORD	`mult,nonn`
	AUTHOR	`njas, Oct 30 2001`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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