It seems your request was cut off! You appear to be looking for information regarding , specifically Season 1, Episode 1 , but the "long post" part of your query suggests you might be looking for a detailed breakdown, a specific summary, or perhaps a place to watch it.
To see these feats in action, you can watch a full breakdown of the episode here: Derren Brown: Trick of the Mind : Season 1 Epis...
Demonstrating his ability to perform complex mathematical calculations at incredible speeds. It seems your request was cut off