Ramanujan's Approximations to Pi/2 pi root 2 as 99 squared over 1103

Approximation to Pi by Srinivasa Ramanujan

$2 \pi \sqrt 2 \approx \dfrac {99^2} {1103}$

Proof

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Source of Name

This entry was named for Srinivasa Ramanujan.

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41972 \ldots$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $3 \cdotp 14159 \, 26535 \, 89793 \, 23846 \, 26433 \, 83279 \, 50288 \, 41971 \ldots$