let n be a positive integer, and let f(n) represent the number of different prime factions of na)find 1)f(1)谢谢大家帮忙
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let n be a positive integer, and let f(n) represent the number of different prime factions of na)find 1)f(1)设n是正整数，f（n)表示n 的不同质因数的个数，1）求f(1)。