A037557 Base 8 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,1.

2, 17, 137, 1098, 8785, 70281, 562250, 4498001, 35984009, 287872074, 2302976593, 18423812745, 147390501962, 1179124015697, 9432992125577, 75463937004618, 603711496036945, 4829691968295561

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Index entries for linear recurrences with constant coefficients, signature (8,0,1,-8).

Formula

G.f.: x*(2+x+x^2) / ( (x-1)*(8*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

Mathematica

Table[FromDigits[PadRight[{}, n, {2, 1, 1}], 8], {n, 20}] (* or *) LinearRecurrence[ {8, 0, 1, -8}, {2, 17, 137, 1098}, 20] (* Harvey P. Dale, Apr 15 2018 *)

Crossrefs

Sequence in context: A037734 A201782 A132433 * A026941 A037493 A037573

Adjacent sequences: A037554 A037555 A037556 * A037558 A037559 A037560

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved