A021081 - OEIS

A021081

Decimal expansion of 1/77.

0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2, 9, 8, 7, 0, 1, 2

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OFFSET

0,3

LINKS

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

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

FORMULA

From Chai Wah Wu, Jun 05 2016: (Start)

a(n) = a(n-1) - a(n-3) + a(n-4) for n > 3.

G.f.: x*(1 + x + 7*x^2)/(1 - x + x^3 - x^4). (End)

MATHEMATICA

First[RealDigits[1/77, 10, 100, -1]] (* or *)