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Semi-1 number (Posted on 2024-03-13) |
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A positive integer n is a semi-1 number if exactly half of the integers from 1 through n contain the digit 1. For example, 16 is semi-1, because exactly 8 of the integers between 1
and 16 contain the digit 1:
{1, 10, 11, 12, 13, 14, 15, 16}.
Find the largest semi-1 number you can find!
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