A300077 Decimal expansion of Pi/2 truncated to n places.

1, 15, 157, 1570, 15707, 157079, 1570796, 15707963, 157079632, 1570796326, 15707963267, 157079632679, 1570796326794, 15707963267948, 157079632679489, 1570796326794896, 15707963267948966, 157079632679489661, 1570796326794896619, 15707963267948966192

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Formula

a(n) = floor((1/2)*Pi*10^n), Pi = 3.14159265...

Maple

seq(floor(1/2*Pi*10^n), n=0..19);

Mathematica

Array[Floor[10^#*Pi/2] &, 20, 0] (* Michael De Vlieger, Feb 25 2018 *)
Module[{nn=30, pi2}, pi2=RealDigits[Pi/2, 10, nn][[1]]; Table[FromDigits[ Take[ pi2, n]], {n, nn}]] (* Harvey P. Dale, Jan 12 2022 *)

Crossrefs

Cf. A011545, A019669.

Sequence in context: A110557 A016304 A016849 * A367497 A232414 A183555

Adjacent sequences: A300074 A300075 A300076 * A300078 A300079 A300080

Keyword

nonn,base,easy,less

Author

Martin Renner, Feb 24 2018

Status

approved