83,431 Recited Digits of Pi
i_like_spam writes "59-year-old Akira Haraguchi of Japan recently broke the world record for the recited number of digits of Pi. Haraguchi-san recited an amazing 83,431 digits of Pi during a 13-hour overnight stretch. This almost doubles the previous record of 42,195 digits by fellow Japanese Hiroyuki Goto.
Though it is not yet updated to reflect the new record, the Pi-World-Ranking-List has the rules for participation and breaks down the ranking by world, continent, and country. Links to world rankings for memorized digits of E and Sqrt(2) are also given."
To set the record straight...
...as a mistake, I initially typed '84,431', which more than doubles the previous record. After finding and correcting my numerical mistake, I forgot to change 'more than doubles' to 'nearly doubles'. Oops.
No. They reiterate a formula in their head.
http://mathworld.wolfram.com/BBPFormula.html