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%I #14 Feb 17 2017 15:35:31
%S 2,114,159,190,234,251,436,616,834,878,1008,1049,1060,1062,1118,1472,
%T 1689,1792,2282,2334,2463,2494,2584,2672,2706,2739,2747,2872,3145,
%U 3210,3312,3427,3429,3442,3652,3855,4000,4074,4104,4287,4419,4493,4635,4675,4708,4839
%N Numbers n such that (n^89-1)/(n-1) is prime.
%H Vincenzo Librandi, <a href="/A217088/b217088.txt">Table of n, a(n) for n = 1..300</a>
%t Select[Range[2, 1000], PrimeQ[(#^89 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *)
%o (PARI) is(n)=isprime((n^89-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y Cf. A002384, A049409, A100330, A162862, A217070-A217089.
%K nonn
%O 1,1
%A _Tim Johannes Ohrtmann_, Sep 26 2012
%E More terms from _T. D. Noe_, Sep 26 2012
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