$$\frac { 5 ^ { m + 3 } + 5 ^ { m } } { 5 ^ { m } \cdot 31 }$$
$\frac{126}{31}\approx 4.064516129$
$\frac{2 \cdot 3 ^ {2} \cdot 7}{31} = 4\frac{2}{31} = 4.064516129032258$
