预期输出形如：{5: [5], 6: [2, 3], 7: [7], 8: [2, 2, 2]} 对应代码如下：

n, m = map(int, input().split())
if n > m:
    n, m = m, n
prime_factor = {} # 保存每个数的质因数
for i in range(n, m + 1):
    j, k = 2, i
    while k != 1:
        if k % j == 0:
            prime_factor[i] = prime_factor.get(i, []) + j
            k //= j
            continue
        j += 1
print(prime_factor)