Decimal expansion of 4*Sum_{k=1..500000} (-1)^(k-1)/(2k-1).

Terms

a(0) =3a(1) =1a(2) =4a(3) =1a(4) =5a(5) =9a(6) =0a(7) =6a(8) =5a(9) =3a(10) =5a(11) =8a(12) =9a(13) =7a(14) =9a(15) =3a(16) =2a(17) =4a(18) =0a(19) =4a(20) =6a(21) =2a(22) =6a(23) =4a(24) =3a(25) =3a(26) =8a(27) =3a(28) =2a(29) =6