solved добавяме най-малката ненулева цифра

Дадена е редица, на която първият член е $1$, а всеки следващ се получава като към предишния се добави най-малката му ненулева цифра. Да се определи колко цифри има числото на позиция $9\cdot 1000^{1000}$
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Property of join

 Let $X$ be path-connected and $Y$ be arbitrary topological space. Then the join $X*Y$ is simply connected.   $\textbf{Proof}.$ We use Van K...

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