User blog comment:Tachyonic Encrypter/Getting bigger than Rayo's function. Is it possible?/@comment-4224897-20141120012826/@comment-1605058-20141120224320

There are scenarios of death of the Universe which say that at one point all particles will be spread around with so small density there won't be pretty much any interaction between them, apart from long-range forces. In this case, because it's eventually constant, this function is actually recursive. And I'd really argue that this number is well-defined, because you have not specified what exactly counts and what doesn't count as a calculation. You also did not address issue of me thinking about values of this function.