29247661domain: NPropertiesPrimalityPrimeyesAppears in sequencesGeneralized Gaussian-Mersenne primes (see below).at n=21A207040Largest prime factor of 4^(2*n+1)+1.at n=22A229747Largest prime factor of 2^(2*n+1)+2^(n+1)+1.at n=21A229768Prime divisors of 2^720 - 1.at n=30A291360Prime numbersat n=1813990