A114452 Numbers k such that k^9 - 7 is prime.

6, 18, 20, 26, 38, 48, 50, 90, 108, 114, 120, 150, 174, 246, 314, 348, 354, 416, 440, 450, 528, 660, 744, 764, 768, 900, 944, 974, 1026, 1040, 1068, 1080, 1094, 1226, 1254, 1320, 1434, 1458, 1496, 1544, 1590, 1626, 1836, 1838, 1844, 1884

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

If k=114 then k^9 - 7 = 3251948521156637177 (prime).

Mathematica

For[n = 2, n < 2000, n += 2, If[PrimeQ[n^9 - 7], Print[n]]] (* Stefan Steinerberger, Feb 17 2006 *)
Select[Range[2000], PrimeQ[#^9-7]&] (* Harvey P. Dale, Dec 10 2013 *)

Prog

(Magma) [n: n in [1..2500] | IsPrime(n^9 - 7)]; // Vincenzo Librandi, Jan 31 2011
(PARI) is(n)=isprime(n^9-7) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A112405, A113868.

Sequence in context: A234752 A370865 A370863 * A253914 A283744 A108762

Adjacent sequences: A114449 A114450 A114451 * A114453 A114454 A114455

Keyword

nonn,easy

Author

Parthasarathy Nambi, Feb 14 2006

Extensions

More terms from Stefan Steinerberger, Feb 17 2006

Status

approved