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A021031 Decimal expansion of 1/27. 1
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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

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.

a(n) = (31*(n mod 3) - 2*(n+1 mod 3) + (n+2 mod 3))/9 (cf. forms of modular arithmetic of Paolo P. Lava, i.e. see A146094). (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

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Last modified October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)