OFFSET
1,2
COMMENTS
a(11) > 20000. - Jinyuan Wang, Feb 01 2020
MATHEMATICA
Do[ If[ PrimeQ[ 4^n + n ], Print[ n ] ], {n, 0, 3000} ]
PROG
(PARI) is(n)=ispseudoprime(4^n+n) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert G. Wilson v, Nov 16 2000
EXTENSIONS
a(10) from Jinyuan Wang, Feb 01 2020
a(11) from Hugo Pfoertner, Mar 02 2024
STATUS
approved