#            使用递归进行整数的因式分解
from random import randint

def factors(num, fact = []):
    #每次从2开始查找因数
    for i in range(2, int(num/2) + 1):
        if num % i == 0:
            fact.append(i)
            factors(num // i, fact)
            break
    else:
        fact.append(num)

facts = []
n = randint(2, 10**8)
factors(n, facts)
result = '*'.join(map(str, facts))
#把facts里的元素，全部转化成字符
#并用*号连接起来，形成一个长的字符串 表达式
if n == eval(result):
    print(n, '= ' + result)