A242201 - OEIS

A242201

Numbers n such that n*8^n - 1 is prime.

1, 2, 7, 12, 25, 44, 219, 252, 507, 1155, 2259, 2972, 4584, 12422, 13905, 75606

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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.

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(13)-a(16) from Harvey's list (see Links).

STATUS

approved