Notably absent from that first link is mention of the elegantly fast-growing Goodstein sequences [1] [1] http://tromp.github.io/pearls.html#goodstein http://tr

Notably absent from that first link is mention of the elegantly fast-growing Goodstein sequences [1] [1] http://tromp.github.io/pearls.html#goodstein http://tromp.github.io/pearls.html#goodstein