id:A115649 - OEIS Search Results

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Numbers whose square is the sum of distinct double factorials (A006882).

+0
3

1, 2, 3, 4, 5, 7, 8, 11, 13, 20, 21, 31, 38, 62, 63, 65, 66, 70, 72, 102, 107, 109, 120, 125, 217, 218, 238, 240, 373, 382, 387, 427, 439, 834, 840, 890, 915, 1440, 1474, 1638, 1650, 3213, 3220, 3241, 3332, 3540, 5886, 6751, 6855, 13730, 14078, 14911 (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	`102^2 = 1!! + 4!! + 11!!.`
	CROSSREFS	`Cf. A006882, A115648, A115650.` `Sequence in context: A080655 A118083 A116470 this_sequence A111795 A046098 A091997` `Adjacent sequences: A115646 A115647 A115648 this_sequence A115650 A115651 A115652`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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