From: Further refinements of Gurland’s formula for π
n
δ n − λ n
μ n − ω n
2
0.00004326
0.00032062
10
8.22562801 × 10−10
1.24569373 × 10−7
100
8.37118328 × 10−17
1.26417115 × 10−12
1,000
8.64864687 × 10−24
1.26540403 × 10−17
10,000
8.37692558 × 10−31
1.2655212 × 10−22