A180742 Numbers n such that n^7-n^5+1 is prime.

2, 4, 7, 9, 14, 20, 22, 30, 35, 39, 45, 51, 56, 57, 70, 75, 79, 87, 89, 92, 104, 110, 111, 115, 121, 122, 127, 160, 164, 176, 195, 210, 211, 222, 232, 237, 246, 255, 257, 294, 301, 306, 315, 336, 356, 360, 372, 375, 382, 406, 412, 429, 444, 445, 462

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[10000], PrimeQ[#^7-#^5+1]&] (* Vincenzo Librandi, Jun 21 2012 *)

Prog

(Magma) [n: n in [0..1000]|IsPrime(n^7-n^5+1)]
(PARI) is(n)=isprime(n^7-n^5+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A100486 A139533 A227116 * A039904 A115162 A278977

Adjacent sequences: A180739 A180740 A180741 * A180743 A180744 A180745

Keyword

nonn,easy

Author

Vincenzo Librandi, Jan 22 2011

Status

approved