33 lines
442 B
Python
33 lines
442 B
Python
def A(x):
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if x % 2 == 0 or x % 5 == 0:
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return -1
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n = 0
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num = 0
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while 1:
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n = (n * 10 + 1) % x
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num += 1
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if n == 0:
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return num
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P = [2]
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p = [2]
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n = 3
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out = []
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while len(out) < 25:
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for i in p:
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if n % i == 0:
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tmp = A(n)
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if tmp > 0:
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if (n - 1) % A(n) == 0:
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out.append(n)
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break
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else:
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P.append(n)
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n += 2
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while n > p[-1] ** 2:
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p.append(P[len(p)])
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print sum(out)
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