A037640 Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,1.

2, 13, 66, 332, 1663, 8316, 41582, 207913, 1039566, 5197832, 25989163, 129945816, 649729082, 3248645413, 16243227066, 81216135332, 406080676663, 2030403383316, 10152016916582, 50760084582913, 253800422914566

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Index entries for linear recurrences with constant coefficients, signature (5,0,1,-5).

Formula

G.f.: x*(x+2)*(1+x) / ( (x-1)*(5*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011

Mathematica

Table[FromDigits[PadRight[{}, n, {2, 3, 1}], 5], {n, 30}] (* Harvey P. Dale, Jul 06 2020 *)
(* Alternative: *)
LinearRecurrence[ {5, 0, 1, -5}, {2, 13, 66, 332}, 30] (* Harvey P. Dale, Jul 06 2020 *)

Crossrefs

Sequence in context: A037626 A160459 A037752 * A391827 A137967 A045764

Adjacent sequences: A037637 A037638 A037639 * A037641 A037642 A037643

Keyword

nonn,base

Author

Clark Kimberling

Status

approved