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 A177106 Numbers n for which n^5-n-1 is not prime. 0

%I

%S 6,7,8,9,12,13,14,18,22,23,24,25,26,29,31,32,33,35,37,38,39,40,41,42,

%T 43,45,46,47,49,51,52,53,54,55,57,58,59,60,61,62,63,64,65,66,67,68,69,

%U 70,71,73,74,76,77,78,79,80,81,83,85,86,87,88,89,90,91,92,93,94,95,96,98

%N Numbers n for which n^5-n-1 is not prime.

%C Includes all numbers == 6 or 8 (mod 17). - _Robert Israel_, Jul 14 2019

%H Robert Israel, <a href="/A177106/b177106.txt">Table of n, a(n) for n = 1..10000</a>

%p remove(t -> isprime(t^5-t-1), [\$2..200]); # _Robert Israel_, Jul 14 2019

%t Select[Range[100],CompositeQ[#^5-#-1]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 18 2019 *)

%Y Cf. A126427 (Numbers n for which n^5-n-1 is prime).

%K nonn,changed

%O 1,1

%A _Vincenzo Librandi_, Jun 25 2010

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Last modified July 20 01:17 EDT 2019. Contains 325168 sequences. (Running on oeis4.)