Let $f$ be a real valued continuous function defined on the positive real axis such that $g(x)=\int_{0}^{x} t f(\mathrm{t}) \mathrm{dt}$.
If $\mathrm{g}\left(x^{3}\right)=x^{6}+x^{7}$, then value of $\displaystyle\sum_{r=1}^{15} f\left(\mathrm{r}^{3}\right)$ is :
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