The answer is yes indeed. It is a special case of brn function. $$ R=\frac{x^B-1}{x^N}=f_{B,N}(x) $$ $$ x=arcf_{B,N}(R)=brn_{B,N}(R) $$ $$ brn_{B,N}(R)=\sum_{g=0}^∞(\frac{R^g}{B^gg!}\prod_{r=1}^{g-1}(-Br+1+Ng)) $$ radius of convergence $$ \left|\frac{N^N(B-N)^{B-N}R^B}{B^B}\right|<1 $$ $$ B∈ℂ, N∈ℂ, R∈ℂ $$ a function named after the mathematician Bring. [article][1] about [ultraexponentiation][2] and ultraroot. [calculator][3] with brn button. [1]: http://glax-plato.ru/exam/Math/brn.pdf [2]: https://www.cyberforum.ru/blog_attachment.php?attachmentid=8110&d=1687342320 [3]: http://glax-plato.ru/