解题思路:
注意事项:
参考代码:
def turn(n): res = '' division = 3 ** 5 while division: res += str(n // division) n -= (n // division) * division division //= 3 return res def is_prime(n): if n < 2: return False for i in range(2, n // 2 + 1): if n % i == 0: return False return True lb, rb = map(int, input().split()) cnt = 0 for i in range(729): temp = sum(map(int, turn(i))) cnt += 1 if temp in range(lb, rb + 1) or is_prime(temp) else 0 print(cnt)
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