OFFSET
1,1
COMMENTS
The associated primes are: 7121, 113921, 455681, 1866465281, 489282674360321, 2004101834179870721, 32065629346877931521, 128262517387511726081, 38764967239633309757747635278627034649067521, 2540500893016608588283749025620101342761288990721, 10162003572066434353134996102480405371045155962881. - Vincenzo Librandi, Jan 06 2019
LINKS
Robert Price, Table of n, a(n) for n = 1..46
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Wilfrid Keller, List of primes k.2^n - 1 for k < 300
Eric Weisstein's World of Mathematics, Proth Prime
MAPLE
select(k->isprime(445*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019
MATHEMATICA
Select[Range[1000], PrimeQ[445*2^# + 1] &]
PROG
(Magma) [n: n in [1..5000] | IsPrime(445*2^n+1)]; // Vincenzo Librandi, Jan 06 2019
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Robert Price, Jan 05 2019
STATUS
approved