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A216591 Numbers k such that 8^k + k^8 - 1 is prime. 1
10, 38, 428, 824, 3902, 4712, 5596, 29572 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(9) > 10^5. Robert Price, Feb 25 2014
LINKS
MATHEMATICA
Select[Range[0, 4000], PrimeQ[8^# + #^8 - 1] &]
PROG
(PARI) is(n)=ispseudoprime(8^n+n^8-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A220206 A218081 A219823 * A249707 A228140 A156674
KEYWORD
nonn,hard,more
AUTHOR
Vincenzo Librandi, Sep 09 2012
EXTENSIONS
a(6)-a(8) from Robert Price, Feb 25 2014
STATUS
approved

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Last modified March 2 15:00 EST 2024. Contains 370493 sequences. (Running on oeis4.)