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    It may not be a direct duplicate to existed katas, but due to the well-known formula and the diffculty of this task, you are not adding new/interesting things to CW.
    Please unpublish and solve more katas so that you can create something interesing new to CW.

    Also, Needs Random Tests.

    And, it's Python, with builtin BigNumber support
    so what are you doing with 5.0000000005e+19?