A021070 Decimal expansion of 1/66.

0, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5, 1, 5

Offset

0,3

Links

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

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

Formula

Multiplicative with a(2^e) = 5, a(p^e) = 1 otherwise. - David W. Wilson, Jun 12 2005

Dirichlet g.f.: zeta(s) * (1 + 1/2^(s-2)). - Amiram Eldar, Jun 09 2025

Example

0.015151515151515151515151515...

Mathematica

Join[{0}, RealDigits[1/66, 10, 120][[1]]] (* Harvey P. Dale, Dec 26 2021 *)
(* Alternative: *)
PadRight[{0}, 120, {5, 1}] (* Harvey P. Dale, Dec 26 2021 *)

Crossrefs

A010686 shifted right.

Sequence in context: A205109 A144432 A010686 * A176260 A098190 A339353

Adjacent sequences: A021067 A021068 A021069 * A021071 A021072 A021073

Keyword

nonn,cons,mult,easy,changed

Author

N. J. A. Sloane

Status

approved