A021031 Decimal expansion of 1/27.

0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7, 0, 3, 7

Offset

0,2

Links

Table of n, a(n) for n=0..98.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 1).

Formula

From Bruno Berselli, Sep 24 2010: (Start)

G.f.: x*(3+7*x)/(1-x^3).

a(n) - a(n-3) = 0 for n > 2.

a(n) = A175833(n) - 4 = 4*(n-3*floor(n/3)) - (1 - (-1)^(n-3*floor((n+1)/3)))/2.

(End)

Example

0.037037037037037037037037037037037037037...

Mathematica

RealDigits[1/27, 10, 108][[1]] (* Alonso del Arte, Feb 26 2015 *)

Crossrefs

Sequence in context: A033920 A005600 A180873 * A291835 A197835 A197005

Adjacent sequences: A021028 A021029 A021030 * A021032 A021033 A021034

Keyword

nonn,cons,easy

Author

N. J. A. Sloane.

Status

approved