34 lines
790 B
Python
34 lines
790 B
Python
from tools import number_theory
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from functools import reduce
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import time
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def update_factor(num, p, factor):
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count = 0
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while not num % p:
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num //= p
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count += 1
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if count:
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factor[p] = count
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return num
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def calc_factor(num, prime):
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factor = {}
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for p in prime:
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if p ** 2 > num:
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break
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num = update_factor(num, p, factor)
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if num > 1:
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factor[num] = 1
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return factor
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def phi(num, prime):
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ret = reduce(lambda x, y: x * (y[0] - 1) * y[0] ** (y[1] - 1), calc_factor(num, prime).items(), 1)
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return ret
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def count(limit):
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prime = list(number_theory.make_prime(int(limit ** 0.5) + 1))
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return sum(map(lambda x: phi(x, prime), range(2, limit + 1)))
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print(count(1000000))
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print(time.process_time())
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