Decimal preperiod
= Decimal preperiod
{title2=$k_0$}
The shortest prefix before the repeating tail of a <decimal representation>. For a <reduced fraction> with <denominator> $2^u5^v m$, where $m>1$ is <coprime> to ten, its length is $\max(u,v)$; the tail length is given by <decimal period from multiplicative order>.