Calculation of 𝜋 to 100,000 decimals
Daniel N. Shanks, John W. Wrench · Mathematics of Computation · 1962
is due to Stornier [6], and has not been previously used in high-precision computation.The computation time breaks down as follows: 8 tan-1 -¿i : 3 hours 7 minutes 4 tan-1 yj^: 2 hours 20 minutes 24 tan-1 $■: 2 hours 34 minutes