17179869187domain: NAppears in sequencesa(n) = 2^n + 3.at n=34A062709a(n) = 3*a(n-1) - 3*a(n-2) + 2*a(n-3), with a(0) = a(1) = -1 and a(2) = 3.at n=34A135446a(n) = 4^n + 3.at n=17A253208a(n) = n + 1 when n <= 3, otherwise a(n) = 2^(n-2) + 3; also iterates of A005187 starting from a(1) = 2.at n=35A256994