91424858111domain: NAppears in sequencesSmallest prime of the form k^n + k^(n-1) - 1.at n=13A126017Primes of the form k*6^m - 1, where k is a Mersenne prime (A000668) and m >= 0.at n=16A186687a(n) = 7*6^n-1.at n=13A198795