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%I #15 Sep 08 2022 08:46:04
%S 10,40,82,113,127,141,170,257,275,287,295,315,344,373,442,468,609,634,
%T 646,663,671,710,819,834,857,884,894,904,992,997,1060,1069,1077,1120,
%U 1143,1190,1232,1253,1261,1280,1291,1347,1407,1436,1448,1483,1514,1570,1642
%N Numbers n such that (n^23-1)/(n-1) is prime.
%H Vincenzo Librandi, <a href="/A217073/b217073.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[2, 1700], PrimeQ[(#^23 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *)
%o (Magma) [n: n in [2..1700] |IsPrime((n^23 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012
%o (PARI) is(n)=isprime((n^23-1)/(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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