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GAIC Math 2024 Problem 2

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Let Al=(4l+1)(4l+2)⋯(4(55+1)l)A_l = (4l+1)(4l+2) \cdots \left(4(5^5+1)l\right). Given a positive integer ll such that 525l∣Al5^{25l} \mid A_l and 525l+1∤Al5^{25l+1} \nmid A_l, the minimum value of ll satisfying these conditions is \underline{\hspace{2cm}}.

Dataset text MathOdyssey. Open licence.

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