A180923 Numbers n such that 111*n + 1 is prime.

2, 16, 18, 20, 26, 28, 30, 38, 40, 42, 46, 56, 60, 62, 68, 72, 82, 86, 88, 96, 110, 112, 118, 130, 132, 138, 140, 150, 156, 158, 160, 166, 178, 192, 196, 210, 216, 220, 226, 228, 240, 242, 248, 250, 266, 276, 278, 280, 290, 292, 300, 306, 320, 326, 342, 348, 350

Offset: 1

Author

Jason Earls, Sep 25 2010

Keywords

• easy
• nonn

Programs

Mathematica

Select[Range[400], PrimeQ[111# + 1] &] (* Harvey P. Dale, Jan 04 2011 *)

PARI

is(n)=isprime(111*n+1) \\ Charles R Greathouse IV, Jun 13 2017