回複:回複:回複:印尼奧賽題(1星)to aceonriver

回答: 回複:印尼奧賽題(1星)AceOnRiver2009-11-04 21:55:09

for even divisors, we need to count 2,4,6,8 etc. and for odd divisors, need to count 3,6,21 etc.

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