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A128459 Numbers n such that 17^n - 2 is a prime. 13
6, 24, 30, 106, 184, 232, 460, 1258, 3480, 5458, 32886 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No more terms through 50000. - Ryan Propper, Dec 06 2008

a(12) > 2*10^5. - Robert Price, Oct 23 2014

LINKS

Table of n, a(n) for n=1..11.

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, or 0 if no such number exists. Cf. A128472 = smallest prime of the form (2n-1)^k - 2 for k>(2n-1), or 0 if no such number exists. Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128460, A128461.

Sequence in context: A209452 A275302 A201596 * A229292 A147826 A247271

Adjacent sequences:  A128456 A128457 A128458 * A128460 A128461 A128462

KEYWORD

hard,more,nonn

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

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Last modified November 18 07:22 EST 2019. Contains 329252 sequences. (Running on oeis4.)