## 1/9801

A couple of days ago, I remembered the following fun fact from my high-school days in Romania: $! \frac{1}{9801}=0,(000102030405\cdots939495969799).$ First, note that I am using the European notation for periodic decimal expansions (or repeating decimals). What you get is a periodic expansion, where all the two-digit numbers from 00 to

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