

A093795


Numbers n such that 9^n+8^(n1) is prime.


20



2, 7, 8, 31, 610, 1292, 4015, 5990, 8887, 9626, 57952, 62116, 84698
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OFFSET

1,1


COMMENTS

a(14) > 10^5.  Robert Price, Mar 05 2016


LINKS

Table of n, a(n) for n=1..13.


EXAMPLE

8 is a member since 98+87 = 45143873 which is a prime number.


MATHEMATICA

Do[ If[ PrimeQ[9^n + 8^(n  1)], Print[n]], {n, 4000}]


PROG

(PARI) is(n)=isprime(9^n+8^(n1)) \\ Charles R Greathouse IV, Feb 17 2017


CROSSREFS

Cf. A082103, A093717, A093793, A093765, A096185, A093794, A093795, A096186.
Sequence in context: A236291 A190175 A081700 * A001493 A000637 A250715
Adjacent sequences: A093792 A093793 A093794 * A093796 A093797 A093798


KEYWORD

nonn,more


AUTHOR

Herman H. Rosenfeld (herm3(AT)pacbell.net), May 18 2004


EXTENSIONS

More terms from Robert G. Wilson v, Jun 18 2004
a(7)a(13) from Robert Price, Mar 05 2016


STATUS

approved



