+0  
 
0
3
1
avatar+760 

Let $d$ be a function taking the positive integers to the nonnegative integers such that $d(p) = 1$ for any prime $p,$ and
d(ab) = b \cdot d(a) + a \cdot d(b)
for all positive integers $a$ and $b.$  Find the number of positive integers $n \le 10$ such that $d(n) = 1.$

 Oct 29, 2024
 #1
avatar+964 
0

The answer is 14.

 Oct 30, 2024

1 Online Users

avatar