59419506941domain: NAppears in sequencesa(1) = 6, a(n) = smallest number of the form k*a(n-1) +1 with the same prime signature p*q (6 = 2*3), where p and q are primes.at n=19A085066a(1) = 6, a(n) = smallest number of the form k*a(n-1) + 1 with the same number of divisors, i.e., 4.at n=19A085067