OFFSET
1,2
EXAMPLE
7^12 - 2 = 13841287199 a prime number.
MATHEMATICA
Do[ If[ PrimeQ[7^n - 2], Print[n]], {n, 1, 2000}] (* Robert G. Wilson v, Dec 22 2003 *)
PROG
(PARI) is(n)=isprime(7^n - 2) \\ Charles R Greathouse IV, Apr 28 2015
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 16 2003
EXTENSIONS
Corrected and extended by Robert G. Wilson v and Ray Chandler, Dec 22 2003
Three more terms from Ryan Propper, Dec 07 2008
a(28)-a(30) from Robert Price, Jan 24 2014
a(31)-a(32) from Paul Bourdelais, Jan 29 2021
a(33) from Paul Bourdelais, Aug 02 2023
STATUS
approved