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A177106
Numbers n for which n^5-n-1 is not prime.
1
6, 7, 8, 9, 12, 13, 14, 18, 22, 23, 24, 25, 26, 29, 31, 32, 33, 35, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 49, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 76, 77, 78, 79, 80, 81, 83, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 98
OFFSET
1,1
COMMENTS
Includes all numbers == 6 or 8 (mod 17). - Robert Israel, Jul 14 2019
LINKS
MAPLE
remove(t -> isprime(t^5-t-1), [$2..200]); # Robert Israel, Jul 14 2019
MATHEMATICA
Select[Range[100], CompositeQ[#^5-#-1]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 18 2019 *)
CROSSREFS
Cf. A126427 (Numbers n for which n^5-n-1 is prime).
Sequence in context: A309404 A120191 A059983 * A269101 A037366 A047551
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Jun 25 2010
STATUS
approved