A139445 Numbers n such that primorial(n)/2 + 32 is prime.

3, 4, 5, 10, 11, 13, 41, 55, 66, 94, 104, 325, 363, 424, 672, 734, 818, 1044, 1389, 1595, 1728, 2870, 3149, 3922, 5352, 9431, 11586, 13991, 17507

Offset: 1

Author

Artur Jasinski, Apr 21 2008

Keywords

• nonn
• more

Comments

a(30)>25000. - Robert Price, Dec 28 2016

Crossrefs

Cf. A067026, A067027, A139439-A139457, A103514.

Programs

Mathematica

k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 32], Print[n]; AppendTo[a, n]], {n, 325}]; a
Position[FoldList[Times,Prime[Range[900]]],?(PrimeQ[#/2+32]&)]//Flatten (* The program generates the first 17 terms of the sequence. *) (* _Harvey P. Dale, Jan 23 2025 *)

Extensions

a(13)-a(22) from Ray Chandler, Jun 16 2013

a(23)-a(29) from Robert Price, Dec 28 2016