Please give me some information about decimal expansion of numbers so that I could try out this problem.
2026-04-01 00:23:42.1775003022
Problem using decimal expansion of a number
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1
The sequence starts $0,\ 2,\ 4,\ 6,\ 8,\ 20,\ 22\ldots$.
Hint: The sequence contains $5$ numbers less than $10$, $25$ numbers less than $100$, and how many numbers less than $10^n$?