id:A125216 - OEIS Search Results

Search: id:A125216

Displaying 1-1 of 1 results found.

page 1

Semiprimes s such that s-/+4 are primes.

+0
2

9, 15, 33, 57, 93, 177, 237, 267, 393, 453, 573, 597, 687, 723, 933, 1167, 1227, 1293, 1527, 1563, 1623, 1983, 2157, 2217, 2463, 2913, 3327, 3453, 3543, 4353, 4647, 5007, 5277, 5403, 5847, 5853, 6033, 6117, 6207, 6267, 6333, 6393, 7023, 7233, 8013, 8097 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Reap[Do[p=Prime[i]; If[PrimeQ[p+8]&&Total[Last/@FactorInteger[p+4]]==2, Sow[p+4]], {i, 2*10^3}]][[2, 1]]`
	CROSSREFS	`Sequence in context: A107076 A155775 A111148 this_sequence A058505 A133763 A146475` `Adjacent sequences: A125213 A125214 A125215 this_sequence A125217 A125218 A125219`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Nov 24 2006`

page 1

Search completed in 0.002 seconds

Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research