id:A115651 - OEIS Search Results

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Powerful(1) numbers (A001694) which are the sum of distinct double factorials (A006882).

+0
5

1, 4, 8, 9, 16, 25, 27, 49, 64, 72, 108, 121, 125, 128, 169, 392, 400, 432, 441, 500, 512, 961, 968, 972, 1125, 1331, 1352, 1444, 3844, 3888, 3969, 4225, 4232, 4356, 4900, 4913, 5184, 5292, 5324, 10404, 10800, 10952, 11449, 11881, 14283, 14400 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.`
	EXAMPLE	`392 = 2^3*7^2 = 8!! + 4!!.`
	CROSSREFS	`Cf. A001694, A006882, A115652, A115653, A115654.` `Adjacent sequences: A115648 A115649 A115650 this_sequence A115652 A115653 A115654` `Sequence in context: A025475 A125643 A002760 this_sequence A062559 A010417 A067252`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.

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