

A287351


Numbers k such that (10^k*361  163)/9 is prime (k > 0).


0



1, 3, 9, 15, 27, 37, 165, 207, 897, 5761, 16753, 17995, 96567
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OFFSET

1,2


COMMENTS

a(14) > 10^5.  Robert Price, Oct 31 2017


LINKS

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


EXAMPLE

If k = 1 then (10^1*361  163)/9 = 383 (prime), so 1 is a term.
If k = 9 then (10^9*361  163)/9 = 40111111093 (prime), so 9 is a term.


MATHEMATICA

ParallelMap[ If[ PrimeQ[ (10^# 361163)/9], #, Nothing] &, Range[6000]]


CROSSREFS

Cf. A247643.
Sequence in context: A087031 A089632 A247643 * A256388 A082897 A339886
Adjacent sequences: A287348 A287349 A287350 * A287352 A287353 A287354


KEYWORD

nonn,hard,more


AUTHOR

Mikk Heidemaa, May 23 2017


EXTENSIONS

a(13) from Robert Price, Oct 31 2017


STATUS

approved



