10以内的素数：2,3,5,7 组成的三位数有：235.253.237.273.257.275.325.352.357.375.327.372.523.532.537.573.572.527.732.723.735.753.752.725.其中既是2的倍数又是3的倍数有：237.273.357.375.327.372.537.573.723.732.735.753