A037656 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,0,2.

3, 21, 149, 1046, 7322, 51256, 358795, 2511565, 17580957, 123066702, 861466914, 6030268400, 42211878803, 295483151621, 2068382061349, 14478674429446, 101350721006122, 709455047042856, 4966185329299995

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Index entries for linear recurrences with constant coefficients, signature (7,0,1,-7)

Formula

G.f.: x*(3+2*x^2) / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

Mathematica

Table[FromDigits[PadRight[{}, n, {3, 0, 2}], 7], {n, 20}] (* Harvey P. Dale, Jul 27 2019 *)

Crossrefs

Sequence in context: A037761 A037649 A037768 * A074577 A007566 A183412

Adjacent sequences: A037653 A037654 A037655 * A037657 A037658 A037659

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved