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%I #14 Sep 08 2022 08:46:04
%S 2,3,5,7,34,37,43,59,72,94,98,110,133,149,151,159,190,207,219,221,251,
%T 260,264,267,282,286,291,319,355,363,373,382,397,398,402,406,408,412,
%U 436,442,486,489,507,542,544,552,553,582,585,592,603,610,614,634,643
%N Numbers n such that (n^13-1)/(n-1) is prime.
%H Vincenzo Librandi, <a href="/A217070/b217070.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[2, 1000], PrimeQ[(#^13 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *)
%o (Magma) [n: n in [2..1000] |IsPrime((n^13 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012
%o (PARI) is(n)=isprime(polcyclo(13,n)) \\ _Charles R Greathouse IV_, Apr 28 2015
%Y Cf. A002384, A049409, A100330, A162862, A217071-A217089.
%K nonn,easy
%O 1,1
%A _Tim Johannes Ohrtmann_, Sep 26 2012
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