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某人编写如下函数来判断a是否为素数,若是,则函数返回True;否则返回False。 Function prime(a As Integer) As Boolean Dim k As Integer, isprime As Boolean If a < 2 Then isprime = False Else isprime = True k = 2 Do While k < a / 2 And isprime If a Mod k = 0 Then isprime = False Else k = k + 1 End If Loop End If prime = isprime End Function 在测试时发现有1个非素数也被判断为素数,这个被错判的数是_____