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

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

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).

Cf. A128472 (smallest prime of the form (2n-1)^k - 2 for k > (2n-1)).

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

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