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    This comment is hidden because it contains spoiler information about the solution

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    Right, so the 'original number' in this case would be 2, not 20?

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    I'm confused about one of the samples tests. Given a seed of 15, the number of numbers added to the test sequence before converging with the base is
    apparently 2 numbers...

    Base Series: 1, 2, 4, 8, 16 .....
    Test Series: 15, 20, 4(?!), 8, 16 ...

    It's my understanding that the number in the test series after 20 should be 22.
    => 20 => [remove 0] => [no other digits to multiply 2 by] => [2 + 20 = 22]
    Do I have this wrong?