OFFSET
1,2
COMMENTS
The associated primes are: 883, 3529, 7057, 3612673, ... - Vincenzo Librandi, Jan 06 2019
When k is even, the associated prime is of form B^2 + 1. - Jeppe Stig Nielsen, Dec 27 2019
LINKS
Jeppe Stig Nielsen, Table of n, a(n) for n = 1..56 (n=1..53 from Robert Price)
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(441*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019
MATHEMATICA
Select[Range[1000], PrimeQ[441*2^# + 1] &]
PROG
(Magma) [n: n in [1..5000] | IsPrime(441*2^n+1)]; // Vincenzo Librandi, Jan 06 2019
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Robert Price, Jan 05 2019
STATUS
approved