id:A065765 - OEIS Search Results

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Sum of divisors of twice square numbers.

+0
6

3, 15, 39, 63, 93, 195, 171, 255, 363, 465, 399, 819, 549, 855, 1209, 1023, 921, 1815, 1143, 1953, 2223, 1995, 1659, 3315, 2343, 2745, 3279, 3591, 2613, 6045, 2979, 4095, 5187, 4605, 5301, 7623, 4221, 5715, 7137, 7905, 5169, 11115, 5679, 8379, 11253 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The sum of divisors of 2m^2 [twice a square] always gives remainder r = 3 modulo 6. See A097022.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	FORMULA	`a(n)=Sigma[2n^2]=A000203[2A000290(n)]` `a(n)=3*A065766(n)`
	CROSSREFS	`Cf. A028982, A000203, A000290` `Adjacent sequences: A065762 A065763 A065764 this_sequence A065766 A065767 A065768` `Sequence in context: A001803 A062741 A117561 this_sequence A014309 A096742 A012256`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 19 2001`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

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