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You are asking for a solution to the equation $10^r\equiv 1$, mod $n$, where in your particular case $n=37$. The multiplicative order is the smallest exponent $r$ such that $x^r\equiv 1$, mod $n$. The multiplicative order is given by the Mathematica command MultiplicativeOrder[x,n], and corresponds to the "Foo" you asked for in your comment to @mgamer. ...

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