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Divisibilityhard
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Let Sn=1n+2n+3n+4nS_n = 1^n + 2^n + 3^n + 4^nSn​=1n+2n+3n+4n. For how many positive integers n≤2024n \le 2024n≤2024 is SnS_nSn​ divisible by 5?