A242178 - OEIS

A242178

Numbers k such that k*8^k + 1 is prime.

5, 17, 23, 1911, 20855, 35945, 42816

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

OFFSET

1,1

LINKS

MATHEMATICA

Select[Range[2000], 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, May 22 2017

CROSSREFS

Cf. similar sequences listed in A242176.

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(5)-a(7) from Loeh's list (see Links) - Bruno Berselli, May 08 2014

STATUS

approved