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MathNet 2023-part-04 — 191 problems (EN–VI) Question 133

Math Olympiad Vault · MathNet 2023-part-04 — 191 problems (EN–VI)

Question 133

A set of positive integers is said to be pilak if it can be partitioned into 2 disjoint subsets $F$ and $T$, each with at least 2 elements, such that the elements of $F$ are consecutive Fibonacci numbers, and the elements of $T$ are consecutive triangular numbers. Find all positive integers $n$ such that the set containing all the positive divisors of $n$ except $n$ itself is pilak.