A037538 Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.

1, 7, 36, 181, 907, 4536, 22681, 113407, 567036, 2835181, 14175907, 70879536, 354397681, 1771988407, 8859942036, 44299710181, 221498550907, 1107492754536, 5537463772681, 27687318863407, 138436594317036, 692182971585181

Offset

1,2

Links

Table of n, a(n) for n=1..22.

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

Formula

G.f.: x*(1+x)^2 / ( (x-1)*(5*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

Mathematica

Module[{nn=30, c}, c=PadRight[{}, nn, {1, 2, 1}]; Table[FromDigits[Take[c, i], 5], {i, nn}]] (* Harvey P. Dale, Jul 24 2012 *)

Crossrefs

Sequence in context: A110310 A054493 A368575 * A037482 A147546 A333060

Adjacent sequences: A037535 A037536 A037537 * A037539 A037540 A037541

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved