Project Euler Problem 5-Smallest multiple

对每个数字分解素因子，最后对每个素因子去其最大的指数，然后把不同素因子的最大指数次幂相乘，得到的就是最小公倍数

python不熟练，代码比较挫

mp = {}

def process(n):
    i = 2
    while i*i <= n:
        cnt = 0
        if n%i == 0:
            while n%i == 0:
                cnt += 1
                n /= i
            if i in mp:
                mp[i] = max(mp[i], cnt)
            else:
                mp[i] = cnt
        i += 1
    if n > 1:
        if n in mp:
            mp[n] = max(mp[n], 1)
        else:
            mp[n] = 1

for i in range(2,21):
    process(i)

res = 1
for x in mp:
    res *= (x**mp[x])
print res