id:A095118 - OEIS Search Results

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a(n) is the sum of the squares of the divisors of n which are <= sqrt(n).

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1, 1, 1, 5, 1, 5, 1, 5, 10, 5, 1, 14, 1, 5, 10, 21, 1, 14, 1, 21, 10, 5, 1, 30, 26, 5, 10, 21, 1, 39, 1, 21, 10, 5, 26, 66, 1, 5, 10, 46, 1, 50, 1, 21, 35, 5, 1, 66, 50, 30, 10, 21, 1, 50, 26, 70, 10, 5, 1, 91, 1, 5, 59, 85, 26, 50, 1, 21, 10, 79, 1, 130, 1, 5, 35, 21, 50, 50, 1, 110, 91 (list; graph; listen)

	OFFSET	`1,4`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`The divisors of 12 which are <= sqrt(12) are 1,2,3, so a(12) = 1^2 + 2^2 + 3^2 = 14.`
	MATHEMATICA	`a[n_]:=Plus@@(Select[Divisors[n], #^2<=n&]^2)`
	CROSSREFS	`Cf. A095119.` `Sequence in context: A050349 A083528 A056957 this_sequence A100947 A096940 A141345` `Adjacent sequences: A095115 A095116 A095117 this_sequence A095119 A095120 A095121`
	KEYWORD	`nonn`
	AUTHOR	`Dean Hickerson (dean.hickerson(AT)yahoo.com), following a suggestion of Leroy Quet May 28 2004`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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