id:A125216 - OEIS Search Results

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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: A091296 A107076 A111148 this_sequence A058505 A133763 A100556` `Adjacent sequences: A125213 A125214 A125215 this_sequence A125217 A125218 A125219`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Nov 24 2006`

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Last modified September 6 09:40 EDT 2008. Contains 143480 sequences.

AT&T Labs Research