A086176 Numbers n such that n*prime(n)+3 is prime.

1, 4, 10, 20, 22, 28, 34, 38, 46, 56, 62, 92, 98, 112, 146, 148, 154, 166, 170, 176, 178, 200, 208, 254, 256, 260, 262, 266, 284, 340, 346, 352, 364, 394, 406, 412, 418, 460, 476, 500, 514, 524, 548, 550, 560, 574, 584, 586, 590, 610, 614, 620, 656, 664, 698

Offset: 1

Author

Zak Seidov, Jul 11 2003

Keywords

• easy
• nonn

Comments

See also A086172, A086173, A086174, A086175, A086177.

Links

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

Crossrefs

Cf. A086172, A086173, A086174, A086175, A086177.

Programs

Magma

[n: n in [1..800] | IsPrime(n*NthPrime(n) + 3)]; // Vincenzo Librandi, Oct 05 2012

Mathematica

Select[Range[1000], PrimeQ[ # Prime[ # ]+3]&]