User blog comment:Flavio61/Louis Epstein number list/@comment-27173506-20160118190252/@comment-12.144.5.30-20160209182146

We know that base means less than bound which means less than iterations:

3 uu 2 < 2 uu 3 < 2 uuu 2.

The Steinhaus Mega is an atomized trifle next to 2 uu 2...the "Megiston" article here says it is between 10^^^11 and 10^^^12 so what are its approximations in ultrex?(Fixing either base or bound to 10,how many u's and what bound or base respectively?)