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A268356 Numbers n such that 8*9^n - 1 is prime. 3
0, 1, 2, 5, 25, 85, 92, 97, 649, 2017, 2978, 3577, 4985, 17978, 21365, 66002, 95305, 142199 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
a(19) > 2*10^5.
LINKS
MATHEMATICA
Select[Range[0, 200000], PrimeQ[8*9^# - 1] &] (* Robert Price, Feb 02 2016 *)
PROG
(PARI) is(n)=ispseudoprime(8*9^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A080626 A015957 A349146 * A329158 A337435 A074417
KEYWORD
nonn,more
AUTHOR
Robert Price, Feb 02 2016
STATUS
approved

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Last modified March 19 03:30 EDT 2024. Contains 370952 sequences. (Running on oeis4.)