2097091domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 2^(n+2) - 3*n - 4.at n=18A095264Primes of the form (2^n - 1)*(2^(m+2)) + 3 where n >= 1, m >= 1.at n=27A224383Prime numbersat n=155607