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A217088 Numbers n such that (n^89-1)/(n-1) is prime. 7
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

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

PROG

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

CROSSREFS

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

Sequence in context: A285145 A278925 A053976 * A034312 A224871 A230471

Adjacent sequences:  A217085 A217086 A217087 * A217089 A217090 A217091

KEYWORD

nonn

AUTHOR

Tim Johannes Ohrtmann, Sep 26 2012

EXTENSIONS

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

STATUS

approved

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Last modified August 9 01:18 EDT 2020. Contains 336310 sequences. (Running on oeis4.)