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A088710 Numbers n which are a product of two primes j and k such that n-j-k is prime. 2
9, 10, 14, 15, 21, 26, 33, 35, 38, 39, 51, 62, 65, 69, 77, 86, 91, 93, 95, 111, 122, 123, 129, 133, 146, 159, 161, 201, 203, 206, 209, 213, 215, 217, 218, 221, 249, 278, 287, 291, 299, 301, 302, 303, 305, 321, 335, 339, 362, 371, 381, 386, 395, 398, 403, 407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

a(2)=10 because 10 has only one pair of prime factors (2 and 5) and 10-2-5=3 which is prime.

MATHEMATICA

ptpQ[n_]:=PrimeOmega[n]==2&&PrimeQ[n-Total[Flatten[Table[#[[1]], #[[2]]]&/@ FactorInteger[n]]]]; Select[Range[500], ptpQ] (* Harvey P. Dale, Jun 04 2018 *)

CROSSREFS

Cf. A001358.

Sequence in context: A169870 A061445 A261614 * A020199 A227943 A114844

Adjacent sequences:  A088707 A088708 A088709 * A088711 A088712 A088713

KEYWORD

nonn

AUTHOR

Chuck Seggelin (barkeep(AT)plastereddragon.com), Oct 11 2003

STATUS

approved

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Last modified June 23 06:39 EDT 2021. Contains 345395 sequences. (Running on oeis4.)