Re: HSC 2017 MX2 Marathon
$ Let $S_{\left ( n,k \right ) }= k+kk+kkk+... +\underbrace{kkkk...k}_{\text{n number of k's}} $ where ${n,k} \in \mathbb{Z}: n>0$ and $ 0<k<10 \\ \\$ Example 1: $ S_{\left ( 5,3 \right ) } = 3+33+333+3333+33333 \\$ Example 2 $: S_{\left ( 4,2 \right ) } =...