2025 IMO Problems/Problem 4
A proper divisor of a positive integer 
is a positive divisor of other than itself.
The infinite sequence 
consists of positive integers, each of which has at least three proper divisors. For each 
, the integer 
is the sum of the three largest proper divisors of 
.
Determine all possible values of 
.
Video Solution
https://www.youtube.com/watch?v=Kb4h_GVFT1k
See Also
| 2025 IMO (Problems) • Resources | ||
| Preceded by Problem 3 |
1 • 2 • 3 • 4 • 5 • 6 | Followed by Problem 5 |
| All IMO Problems and Solutions | ||
