id:A115650 - OEIS Search Results

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Triangular numbers which are the sum of distinct double factorials (A006882).

+0
3

1, 3, 6, 10, 15, 21, 28, 66, 105, 120, 153, 171, 435, 561, 946, 1378, 1485, 3916, 4005, 4278, 4851, 4950, 11781, 14365, 15576, 47586, 50086, 51360, 57970, 60378, 60726, 61425, 61776, 139128, 145530, 146070, 149878, 150426, 182710, 659526, 702705 (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	`T(527) = 19128 = 13!! + 10!! + 7!! + 6!!.`
	CROSSREFS	`Cf. A006882, A115648, A115649.` `Adjacent sequences: A115647 A115648 A115649 this_sequence A115651 A115652 A115653` `Sequence in context: A066353 A117520 A062099 this_sequence A025745 A101551 A051166`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

AT&T Labs Research