Start with any number of counters in any number of piles. 2 players take it in turns to remove any number of counters from a single pile. The loser is the player who takes the last counter.
Find b where 3723(base 10) = 123(base b).
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The following solution was recieved from Andrei of School 205 Bucharest. Well done and thank you Andrei.
Therefore both expressions can be factorised, so they are composite.