+0  
 
+2
583
1
avatar+140 

Let $f(n)$ be the sum of all the divisors of a positive integer $n$. If $f(f(n)) = n+2$, then call $n$ superdeficient. How many superdeficient positive integers are there?

 Mar 27, 2019
 #1
avatar
-1

There are 8 superdeficient positive integers.

 Nov 30, 2019

8 Online Users