User blog comment:Superman37891/LORD/@comment-31663462-20170419010639/@comment-30754445-20170419103230

Rayo(10100+1) will probably suffice.

And Rayo (10100+1010) will definitely do the job: Once we used 10100 characters to define Rayo's number, the remaining 10 billion will be more than enough to define f ω² (x) which is stronger than all the functions used in the post. :-)