<a href="https://hubski.com//pub/438042">Discuss this on Hubski.</a>
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Would this be considered part of number theory? Regardless, I always love the weird little collisions like this, where some random function ends up giving the same result as some other.
I'd say it borders mathematical analysis and computational mathematics. Many results from the paper are expressed in terms of special functions, which pop up all around maths, especially applied.