id:A115585 - OEIS Search Results

Search: id:A115585

Displaying 1-1 of 1 results found.

page 1

Semiprimes with a semiprime sum of factors.

+0
3

4, 9, 14, 21, 25, 26, 33, 38, 46, 49, 57, 62, 69, 74, 85, 93, 94, 106, 121, 129, 133, 134, 145, 166, 169, 177, 178, 205, 213, 217, 218, 226, 237, 249, 253, 254, 262, 265, 278, 289, 309, 314, 334, 361, 362, 393, 398, 417, 422, 445, 466, 469, 489, 493, 502, 505 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`314 = 2157, and 2 + 157 = 159 =3 53 (semiprime).`
	MATHEMATICA	`fQ[n_] := Plus @@ Last /@ FactorInteger@n == 2; Select[ Range@513, fQ@# && fQ[ Plus @@ Flatten[ Table[First@#, {Last@#}] & /@ FactorInteger@# ]] &] (* Robert G. Wilson v *)`
	CROSSREFS	`Sequence in context: A016897 A045293 A023488 this_sequence A099980 A004630 A073497` `Adjacent sequences: A115582 A115583 A115584 this_sequence A115586 A115587 A115588`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Mar 09 2006`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 12 2006`

page 1

Search completed in 0.002 seconds

Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research