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Semi-1 number (Posted on 2024-03-13) Difficulty: 3 of 5
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!

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Nicesarausa2024-10-08 23:57:23
Some ThoughtsPuzzle ThoughtsK Sengupta2024-03-13 09:34:44
Solutioncomputer exploration plus analytic limitCharlie2024-03-13 08:34:52
SolutionComputer solutionLarry2024-03-13 08:12:22
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