id:A074400 - OEIS Search Results

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Sum of the even divisors of 2n.

+0
5

2, 6, 8, 14, 12, 24, 16, 30, 26, 36, 24, 56, 28, 48, 48, 62, 36, 78, 40, 84, 64, 72, 48, 120, 62, 84, 80, 112, 60, 144, 64, 126, 96, 108, 96, 182, 76, 120, 112, 180, 84, 192, 88, 168, 156, 144, 96, 248, 114, 186, 144, 196, 108, 240, 144, 240, 160, 180, 120, 336, 124, 192 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`2*sigma(n)`
	EXAMPLE	`The even divisors of 12 are 12, 6, 4, 2, which sum to 24, so a(6) = 24.`
	MAPLE	`with(numtheory): seq(2*sigma(n), n=1..65);`
	CROSSREFS	`2*A000203(n).` `Sequence in context: A002511 A074383 A107505 this_sequence A165607 A109440 A063242` `Adjacent sequences: A074397 A074398 A074399 this_sequence A074401 A074402 A074403`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Nov 25 2002`
	EXTENSIONS	`More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 24 2004`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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