1698693120domain: NAppears in sequencesLeast number whose number of divisors is A007304(n) (the n-th number that is the product of 3 distinct primes).at n=20A061299Main diagonal of the table of k-almost primes (A078840): a(n) = (n+1)-st integer that is an n-almost prime.at n=27A078841Row sums of triangle A128182.at n=25A128183