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A128459
Numbers k such that 17^k - 2 is a prime.
14
6, 24, 30, 106, 184, 232, 460, 1258, 3480, 5458, 32886
OFFSET
1,1
COMMENTS
No more terms through 50000. - Ryan Propper, Dec 06 2008
a(12) > 2*10^5. - Robert Price, Oct 23 2014
MATHEMATICA
Do[ f = 17^n - 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n, 1, 1000} ]
CROSSREFS
Cf. A084714 (smallest prime of the form (2n-1)^k - 2).
Cf. A128472 (smallest prime of the form (2n-1)^k - 2 for k > (2n-1)).
Sequence in context: A209452 A275302 A201596 * A229292 A147826 A247271
KEYWORD
nonn,hard,more
AUTHOR
Alexander Adamchuk, Mar 14 2007
EXTENSIONS
2 more terms from Stefan Steinerberger, May 05 2007
Two more terms from Ryan Propper, Jan 16 2008
One more term from Ryan Propper, Dec 06 2008
STATUS
approved