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A114452 Numbers k such that k^9 - 7 is prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A074791 A093106 A234752 * 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

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Last modified December 15 22:36 EST 2018. Contains 318155 sequences. (Running on oeis4.)