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MathNet 2025 — Part 02 (100 complete bilingual questions) Question 35

Math Olympiad Vault · MathNet 2025 — Part 02 (100 complete bilingual questions)

Question 35

$$
a_1 = 24, \quad a_2 = 2025, \quad \text{and} \quad a_{n+2} = 3 \cdot a_{n+1} \cdot a_n^4 \quad \text{for all } n \ge 1.
$$
Determine all $n \ge 1$ for which there exists an integer $x$ such that $a_n = x^3$.