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A217083 Numbers n such that (n^67-1)/(n-1) is prime. 6

%I

%S 46,122,238,304,314,315,328,332,346,372,382,426,440,491,496,510,524,

%T 528,566,638,733,826,1016,1054,1071,1214,1309,1338,1388,1401,1457,

%U 1512,1536,1582,1624,1718,1773,1814,1816,1825,1952,1985,2021,2072,2308,2349,2449,2481

%N Numbers n such that (n^67-1)/(n-1) is prime.

%H Vincenzo Librandi, <a href="/A217083/b217083.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[2, 2500], PrimeQ[(#^67 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *)

%o (PARI) is(n)=isprime((n^67-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017

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

%K nonn,easy

%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 June 18 04:41 EDT 2021. Contains 345098 sequences. (Running on oeis4.)