

A197723


Decimal expansion of (3/2)*Pi.


3



4, 7, 1, 2, 3, 8, 8, 9, 8, 0, 3, 8, 4, 6, 8, 9, 8, 5, 7, 6, 9, 3, 9, 6, 5, 0, 7, 4, 9, 1, 9, 2, 5, 4, 3, 2, 6, 2, 9, 5, 7, 5, 4, 0, 9, 9, 0, 6, 2, 6, 5, 8, 7, 3, 1, 4, 6, 2, 4, 1, 6, 8, 8, 8, 4, 6, 1, 7, 2, 4, 6, 0, 9, 4, 2, 9, 3, 1, 3, 4, 9, 7, 9, 4, 2, 0, 5, 2, 2, 3, 8, 0, 1, 3, 1, 7, 5, 6, 0, 1, 9, 7, 3, 2, 2
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OFFSET

1,1


COMMENTS

As radians, this is equal to 270 degrees or 300 gradians.
Multiplying a number by i (with i being the imaginary unit sqrt(1)) is equivalent to rotating it by this amount on the complex plane.
Named 'Pau' by Randall Munroe, as a humorous compromise between Pi and Tau.  Orson R. L. Peters, Jan 08 2017


LINKS

Ivan Panchenko, Table of n, a(n) for n = 1..1000
Randall Munroe, xkcd: Pi vs. Tau


FORMULA

2Pi  Pi/2 = Pi + Pi/2.


EXAMPLE

4.712388980384689857693965074919254326296...


MAPLE

Digits:=100: evalf(3*Pi/2); # Wesley Ivan Hurt, Jan 08 2017


MATHEMATICA

RealDigits[3Pi/2, 10, 105][[1]]


PROG

(PARI) 3*Pi/2 \\ Charles R Greathouse IV, Jul 06 2018


CROSSREFS

Cf. A019669.
Sequence in context: A021959 A188735 A254338 * A186191 A256507 A123734
Adjacent sequences: A197720 A197721 A197722 * A197724 A197725 A197726


KEYWORD

nonn,cons


AUTHOR

Alonso del Arte, Oct 17 2011


STATUS

approved



