

A272621


Numbers n such that 10^n9^(n1) is prime.


0



3, 9, 15, 155, 217, 281, 287, 491, 563, 581, 983, 2243, 4375, 8409, 98669
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OFFSET

1,1


COMMENTS

a(16) > 10^5.


LINKS

Table of n, a(n) for n=1..15.


EXAMPLE

3 is a member since 10^39^2 = 100081 = 919 which is a prime number.


MATHEMATICA

Select[Range[0, 100000], PrimeQ[10^#  9^(#  1)] &]


PROG

(PARI) is(n)=ispseudoprime(10^n9^(n1)) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A093713, A082103, A093717, A093793, A096185, A093765, A093794, A093795, A096186.
Sequence in context: A242438 A083556 A015664 * A134137 A174179 A076362
Adjacent sequences: A272618 A272619 A272620 * A272622 A272623 A272624


KEYWORD

nonn,more


AUTHOR

Robert Price, May 03 2016


STATUS

approved



