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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 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 January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)