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 A250193 Numbers n such that Phi(46,n) is prime, where Phi is the cyclotomic polynomial. 18

%I

%S 2,3,7,16,17,18,25,46,47,106,110,111,118,136,144,145,230,238,361,382,

%T 422,439,474,494,495,519,588,639,657,707,733,751,802,831,863,902,925,

%U 976,994,1001,1059,1140,1181,1240,1249,1319,1375,1442,1458,1508,1699,1734,1751,1757,1760,1766,1807,1849,1897,1904,1914,1922

%N Numbers n such that Phi(46,n) is prime, where Phi is the cyclotomic polynomial.

%H G. C. Greubel, <a href="/A250193/b250193.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[2000], PrimeQ[(#^23 + 1) / (# + 1)] &] (* _Vincenzo Librandi_, Jan 15 2015 *)

%o (MAGMA) [n: n in [1..2000]| IsPrime((n^23+1) div (n+1))]; // _Vincenzo Librandi_, Jan 15 2015

%o (PARI) is(n)=isprime(polcyclo(46,n)) \\ _Charles R Greathouse IV_, Sep 08 2015

%Y Cf. A246392.

%K nonn

%O 1,1

%A _R. J. Mathar_, Jan 12 2015

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Last modified September 24 12:08 EDT 2021. Contains 347642 sequences. (Running on oeis4.)