A021499 Decimal expansion of 1/495.

0, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Comments

0, then repeat 0, 2. [Arkadiusz Wesolowski, Jul 22 2011]

Links

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

Crossrefs

A010673 shifted right.

Programs

Mathematica

Join[{0,0},RealDigits[1/495,10,120][[1]]] (* or *) PadRight[{0},120,{2,0}] (* Harvey P. Dale, Dec 13 2020 *)

Formula

a(n) = 1 + (-1)^n - 2*0^n = (-1 - A033999(n))*A062157(n). [Arkadiusz Wesolowski, Jul 22 2011]

G.f.: 2*x^2/(1-x^2). - Bruno Berselli, Jul 22 2011