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MathNet 2020 — Math Olympiad Vault — Part 01 Question 96

Math Olympiad Vault · MathNet 2020 — Math Olympiad Vault — Part 01

Question 96

For a positive integer $n$, we let $s(n)$ denote the sum of the proper divisors of $n$ (excluding $n$ itself). Does there exist a positive integer $a$ for which the equation
$$
s(n) = a + n
$$
has infinitely many solutions?