login
A177026
Primes of the form 4^k*(2^k-1)+1.
0
5, 449, 144114913197948929, 5070602400617769700807459995649, 11417981541647673977863886842678355104249151489
OFFSET
1,1
COMMENTS
a(6) has 288 digits.
FORMULA
a(n) = 8^A098856(n)-4^A098856(n)+1.
PROG
(Magma) [a: n in [0..350]|IsPrime(a) where a is 8^n-4^n+1^n];
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Vincenzo Librandi, Dec 09 2010
STATUS
approved