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A272829
Numbers n such that 8^n-7^(n+1) is prime.
0
27, 43, 61, 105, 835, 2313, 5907, 32455, 33657
OFFSET
1,1
COMMENTS
a(10) > 10^5. - Robert Price, May 04 2016
MATHEMATICA
Select[Range[15, 100000], PrimeQ[8^# - 7^(# + 1)]]
PROG
(PARI) is(n)=ispseudoprime(8^n-7^(n+1)) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A372443 A355903 A124940 * A306118 A114446 A141229
KEYWORD
nonn,more
AUTHOR
Robert Price, May 07 2016
STATUS
approved