I wonder if anybody knows how to calculate the series below? $\sum \limits_{k=0}^\infty q^{2^k}$ if $|q|\lt1$?
Thanks a lot for answers.
I wonder if anybody knows how to calculate the series below? $\sum \limits_{k=0}^\infty q^{2^k}$ if $|q|\lt1$?
Thanks a lot for answers.