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A128459 Numbers n such that 17^n - 2 is a prime. 13

%I

%S 6,24,30,106,184,232,460,1258,3480,5458,32886

%N Numbers n such that 17^n - 2 is a prime.

%C No more terms through 50000. - _Ryan Propper_, Dec 06 2008

%C a(12) > 2*10^5. - _Robert Price_, Oct 23 2014

%t Do[ f = 17^n - 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n,1,1000} ]

%Y 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.

%K hard,more,nonn

%O 1,1

%A _Alexander Adamchuk_, Mar 14 2007

%E 2 more terms from _Stefan Steinerberger_, May 05 2007

%E Two more terms from _Ryan Propper_, Jan 16 2008

%E One more term from _Ryan Propper_, Dec 06 2008

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)