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A217089 Numbers n such that (n^97-1)/(n-1) is prime. 26

%I #13 Feb 17 2017 11:58:57

%S 12,90,104,234,271,339,420,421,428,429,464,805,909,934,1054,1114,1116,

%T 1128,1144,1159,1193,1364,1788,2086,2215,2254,2448,2461,2593,2595,

%U 2771,2787,2829,2859,2952,3029,3075,3144,3250,3265,3268,3301,3701,3752,3875,4026

%N Numbers n such that (n^97-1)/(n-1) is prime.

%H Vincenzo Librandi, <a href="/A217089/b217089.txt">Table of n, a(n) for n = 1..300</a>

%t Select[Range[2, 1000], PrimeQ[(#^97 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *)

%o (PARI) is(n)=isprime((n^97-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017

%Y Cf. A002384, A049409, A100330, A162862, A217070-A217088.

%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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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)