$\displaystyle \frac{7^{49}}{3}$\displaystyle \frac{7^{49}}{3}

$\displaystyle \frac{7^{50}}{3}$\displaystyle \frac{7^{50}}{3}

$\displaystyle \frac{7^{51}}{3}$\displaystyle \frac{7^{51}}{3}

$\displaystyle \frac{7^{52}}{3}$\displaystyle \frac{7^{52}}{3}