9^n+2是不是质数vb编程如下Private Sub Command1_Click()Dim a As IntegerDim b As IntegerDim c As Singlea = 1b = 2Do Until c - intc = 0Do Until c - intc = 0 Or 9 ^ a - 3

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9^n+2是不是质数vb编程如下Private Sub Command1_Click()Dim a As IntegerDim b As IntegerDim c As Singlea = 1b = 2Do Until c - intc = 0Do Until c - intc = 0 Or 9 ^ a - 3

9^n+2是不是质数vb编程如下Private Sub Command1_Click()Dim a As IntegerDim b As IntegerDim c As Singlea = 1b = 2Do Until c - intc = 0Do Until c - intc = 0 Or 9 ^ a - 3
9^n+2是不是质数
vb编程如下
Private Sub Command1_Click()
Dim a As Integer
Dim b As Integer
Dim c As Single
a = 1
b = 2
Do Until c - intc = 0
Do Until c - intc = 0 Or 9 ^ a - 3

9^n+2是不是质数vb编程如下Private Sub Command1_Click()Dim a As IntegerDim b As IntegerDim c As Singlea = 1b = 2Do Until c - intc = 0Do Until c - intc = 0 Or 9 ^ a - 3
不是,n=0,1,2,4..都是,但n=3时不是
当n=3时,9^3+2=731=17*43

如果是9^N+2就不是,如果是(9^N)+2也不是,因为N为负数的话,就为分数,分数不是质数。