User blog comment:Deedlit11/Extending the fast-growing hierarchy to nonrecursive ordinals/@comment-25418284-20130325203802/@comment-25418284-20130325221647

There are some issues with MathJax racing against Wikia's features; I'll attend to them eventually.

I don't like the idea of exhausting all the primes too quickly, but this seems okay.

Consider Kleene's O with the 7-extension; I'll call it \(\mathcal{O}_2\). What's the supremum of all ordinals with notations under \(\mathcal{O}_2\)?