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Revision History for A177106

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A177106

Numbers n for which n^5-n-1 is not prime.
(history; published version)

#7 by N. J. A. Sloane at Sun Jul 14 13:42:32 EDT 2019

STATUS

proposed

approved

#6 by Robert Israel at Sun Jul 14 12:35:35 EDT 2019

STATUS

editing

proposed

#5 by Robert Israel at Sun Jul 14 12:35:22 EDT 2019

COMMENTS

Includes all numbers == 6 or 8 (mod 17). - Robert Israel, Jul 14 2019

LINKS

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

MAPLE

remove(t -> isprime(t^5-t-1), [$2..200]); # Robert Israel, Jul 14 2019

STATUS

approved

editing

#4 by Harvey P. Dale at Sat May 18 09:19:07 EDT 2019

STATUS

editing

approved

#3 by Harvey P. Dale at Sat May 18 09:19:05 EDT 2019

MATHEMATICA

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

STATUS

approved

editing

#2 by Russ Cox at Fri Mar 30 18:38:21 EDT 2012

AUTHOR

_Vincenzo Librandi (vincenzo.librandi(AT)tin.it), _, Jun 25 2010

Discussion

Fri Mar 30

18:38

OEIS Server: https://oeis.org/edit/global/215

#1 by N. J. A. Sloane at Sun Jul 11 03:00:00 EDT 2010

NAME

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

DATA

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

CROSSREFS

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

KEYWORD

nonn,new

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 25 2010

STATUS

approved