# get_factor_geometric_progression¶

This function provides the factor in a geometric series which first element is ‘a0’, has ‘n’ points and the sum of the spacings is ‘Sn_target’ approximately.

$\sum_{k=1}^n a_0 r^{k-1} = \frac{a_0 (1 - r^n)}{1 - r}$