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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

3 votes
3 answers
326 views

Repunit replication

Repunit is a number consisting only of $1$s (here in base $10$). Examples - $1$, $11$, $11111$. Goal Create 10 first repunits $n$-digits long from least possible number instances of numbers $n$. For e …
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10 votes

3d x 1d = 2d x 2d

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