A086174 Numbers n such that n*prime(n)+2 is a prime.

3, 29, 33, 45, 65, 81, 91, 93, 95, 101, 103, 105, 109, 123, 153, 155, 189, 201, 225, 251, 253, 273, 283, 291, 305, 321, 363, 367, 371, 375, 387, 429, 431, 469, 475, 501, 515, 517, 525, 541, 567, 601, 613, 627, 633, 643, 669, 675, 701, 715, 717, 723, 729, 735

Offset: 1

Author

Zak Seidov, Jul 11 2003

Keywords

• easy
• nonn

Comments

See also A086172, A086173, A086175, A086176, A086177.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A086172, A086173, A086175, A086176, A086177.

Programs

Magma

[n: n in [1..800] | IsPrime(n*NthPrime(n) + 2)]; // Vincenzo Librandi, Oct 05 2012

Mathematica

Select[Range[1000], PrimeQ[ # Prime[ # ]+2]&]