Definition:Wallis's Number/Historical Note
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Historical Note on Wallis's Number
It has subsequently been used as a test for a number of different methods of approximation.
It is known to over $4000$ digits.
- April 1984: Fred Gruenberger: How to handle numbers with thousands of digits, and why one might want to (Scientific American Vol. 250, no. 4: 19 – 26)
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $2 \cdotp 094 \, 551 \ldots$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $2 \cdotp 09455 \, 1 \ \ldots$