A126809 - cp's OEIS frontend

A126809 Minimum number of terms required in the Gregory-Leibniz series, i.e., 4(1 - 1/3 + 1/5 - 1/7 + 1/9 - ...), to obtain a value of Pi correct to n decimal digits.

n	a(n)
1	3
2	19
3	119
4	1688
5	10794
6	136121
7	1530012
8	18660270
9	156001209
10	1695509436
11	11136696006
12	102111268282
13	1260654956982
14	10725187563686
15	147895359776637
16	1313133218365935
17	16250291773636035
18	118166387818704586
19	1860961545617561679
20	15963377896404315146

[3, 19, 119, 1688, 10794, 136121, 1530012, 18660270, 156001209, 1695509436, 11136696006, 102111268282, 1260654956982, 10725187563686, 147895359776637, 1313133218365935, 16250291773636035, 118166387818704586, 1860961545617561679, 15963377896404315146]

cp's OEIS Frontend

A126809 Minimum number of terms required in the Gregory-Leibniz series, i.e., 4(1 - 1/3 + 1/5 - 1/7 + 1/9 - ...), to obtain a value of Pi correct to n decimal digits.

Table of values

List of values