id:A115654 - OEIS Search Results

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Semiprimes (A001358) which are the sum of distinct double factorials (A006882).

+0
4

4, 6, 9, 10, 14, 15, 21, 25, 26, 49, 51, 57, 58, 62, 65, 69, 74, 77, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 155, 158, 159, 161, 166, 169, 177, 178, 386, 393, 394, 395, 398, 403, 407, 411, 413, 437, 445, 446, 447, 451, 453, 458, 489, 493, 497 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.`
	EXAMPLE	`384 = 2*19 = 8!!+2!!.`
	CROSSREFS	`Cf. A006882, A001358, A115651, A115652, A115653.` `Sequence in context: A157931 A046368 A113433 this_sequence A036326 A078972 A115652` `Adjacent sequences: A115651 A115652 A115653 this_sequence A115655 A115656 A115657`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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