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首先,如下61個數:11,11+33,11+2×33,11+60×33(即1991)滿足題設條件,另一方面,設a1<a2<an是從1,22010中取出的滿足題設條件的數,對於這n個數中的任意4個數ai,aj,ak,am,因為33|(ai+ak+am),33|(…
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