5486745600domain: NAppears in sequencesa(n) = Product_{i=1..n} i*rad(i) where rad(n) = A007947(n).at n=9A277174Numbers that reach 1 under the iterations of the map k -> k/d(k) if d(k) | k, and k -> k otherwise, where d(k) is the number of divisors of k (A000005).at n=26A330816