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def euler_097():
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mod = 10**10 # we want the last ten digits
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s = 1
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for _ in range(7830457):
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s = (s * 2) % mod
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s = (28433 * s) % mod
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s = s + 1
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return s
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if __name__ == "__main__":
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solution = euler_097()
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print("e097.py: " + str(solution))
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assert(solution == 8739992577)
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