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A125883
Numbers k for which k^5+k^4-1 is prime.
4
2, 4, 7, 9, 11, 13, 16, 17, 18, 26, 27, 29, 31, 33, 34, 38, 39, 40, 43, 47, 50, 57, 59, 65, 69, 70, 76, 81, 89, 90, 92, 93, 95, 103, 107, 109, 126, 128, 129, 138, 140, 148, 162, 167, 179, 182, 183, 192, 197, 206, 209, 211, 221, 223, 226, 228, 229, 230, 234, 240
OFFSET
1,1
LINKS
MATHEMATICA
Do[If[PrimeQ[x^5 + x^4 - 1], Print[x]], {x, 1, 200}]
Select[Range[200], PrimeQ[#^5+#^4-1]&] (* Harvey P. Dale, Apr 10 2018 *)
PROG
(PARI) is(n)=isprime(n^5+n^4-1) \\ Charles R Greathouse IV, May 15 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 14 2006
EXTENSIONS
More terms from Amiram Eldar, Mar 18 2020
STATUS
approved