100776960000domain: NAppears in sequencesa(1)=1, a(n) = p*a(n-1), where p is the smallest prime satisfying gcd(n,p)=1.at n=26A160505a(n) = Product_{d|n} lcm(d, sigma(d)) where sigma(k) is the sum of divisors of k (A000203).at n=29A334805