1994 OIM Problems/Problem 1

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Problem

A natural number $n$ is said to be "sensible" if there exists an integer $r$, with $1<r<n-1$, such that the representation of $n$ in base $r$ has all its digits equal. For example, 62 and 15 are "sensible", since 62 is 222 in base 5 and 15 is 33 in base 4.

Prove that 1993 is NOT "sensible" but 1994 is.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also

https://www.oma.org.ar/enunciados/ibe9.htm