68719476739domain: NAppears in sequencesNumbers of the form 2^(p-1)+3, where p is prime.at n=11A229065a(n) = 4^n + 3.at n=18A253208a(n) = n + 1 when n <= 3, otherwise a(n) = 2^(n-2) + 3; also iterates of A005187 starting from a(1) = 2.at n=37A256994