30043474230domain: NAppears in sequencesSmallest number beginning with 3 and having exactly n distinct prime divisors.at n=9A077328Smallest number beginning with 3 that is the product of exactly n distinct primes.at n=9A106413a(n) = n*(n^2 - 2*n + 4)*binomial(2*n,n)/((n + 1)*(n + 2)).at n=17A301972