33 lines
608 B
Python
33 lines
608 B
Python
#!/usr/bin/env python3
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def primes(n):
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sieve = [True] * n
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for p in range(2, int(n**0.5)):
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if not sieve[p]:
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continue
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for i in range(p**2, n, p):
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sieve[i] = False
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return [i for i, p in enumerate(sieve) if p][2:]
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target = 40
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repw = 10**9
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lim = 10**6
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nums = primes(lim)
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c = 0
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s = 0
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for p in nums[3:]:
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if p%4 != 1 and p%5 != 1:
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continue
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if pow(10, repw, 9*p) == 1:
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c += 1
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s += p
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#print c, p
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if c == target:
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break
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if c < target:
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print("Limit reached. Count = {}/{}".format(c, target))
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print(s)
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