PTA的Python练习题（十九）

def fn(m, n):
  sum=res=0
  for i in range(1, n+1):
  sum=sum+m
  m=m*10
  res=res+sum
  return res

def isPrime(num):
    num=int(num)
    for i in range(2,num):
        if num%i==0 :
            return False
    if(num!=1):
        return True
def PrimeSum(a,b):
    sum=0
    for i in range(a,b+1):
        if isPrime(i):
            sum+=i
    return sum