A088710 Numbers n which are a product of two primes j and k such that n-j-k is prime.

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

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: A369641 A169870 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