8147739600domain: NAppears in sequencesValue of Product[k/sd(k,3),k=1..n], where sd[k,b] is the sum of the digits of k represented in base b.at n=18A109490Squares of terms are the intersection of A025487 and A217584.at n=19A333969a(n) is the smallest number with exactly n divisors that are square pyramidal numbers.at n=24A358543