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A242201
Numbers n such that n*8^n - 1 is prime.
12
1, 2, 7, 12, 25, 44, 219, 252, 507, 1155, 2259, 2972, 4584, 12422, 13905, 75606
OFFSET
1,2
MATHEMATICA
Select[Range[3000], PrimeQ[# 8^# - 1] &]
PROG
(Magma) [n: n in [0..2000] | IsPrime(n*8^n-1)];
(PARI) is(n)=ispseudoprime(n*8^n-1) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
Cf. similar sequences listed in A242200.
Sequence in context: A122264 A079824 A059329 * A350093 A177747 A288888
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, May 09 2014
EXTENSIONS
a(13)-a(16) from Harvey's list (see Links).
STATUS
approved