Fifteen decimal places for pi
Date: Around 1995
I would really like to impress my friends by knowing about 15 decimal places
of pi. All I know is 3.1415927. Please tell me more digits of pi.
You might be interested in the book, A History of Pi, by Peter Beckmann.
Millions of digits of pi have now been computed. My Handbook of Mathematics
Functions gives 25 digits as 3.1415 92653 58979 32384 62643. There is an
interesting history of fractions that approximate pi. Older texts always
included 22/7 (correct to 3 decimal places, rounded) and I believe that
ancient China is credited with 355/113 (6 decimal places). With computer
help we have discovered 104348/33215 (at least as good as a ten digit
411557987/131002976 = 3.141592653589793
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Update: June 2012