A217088 Numbers n such that (n^89-1)/(n-1) is prime.

2, 114, 159, 190, 234, 251, 436, 616, 834, 878, 1008, 1049, 1060, 1062, 1118, 1472, 1689, 1792, 2282, 2334, 2463, 2494, 2584, 2672, 2706, 2739, 2747, 2872, 3145, 3210, 3312, 3427, 3429, 3442, 3652, 3855, 4000, 4074, 4104, 4287, 4419, 4493, 4635, 4675, 4708, 4839

Offset: 1

Author

Tim Johannes Ohrtmann, Sep 26 2012

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A002384, A049409, A100330, A162862, A217070-A217089.

Programs

Mathematica

Select[Range[2, 1000], PrimeQ[(#^89 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *)

PARI

is(n)=isprime((n^89-1)/(n-1)) \\ Charles R Greathouse IV, Feb 17 2017

Extensions

More terms from T. D. Noe, Sep 26 2012