A037550 Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,2.

1, 11, 101, 910, 8192, 73730, 663571, 5972141, 53749271, 483743440, 4353690962, 39183218660, 352648967941, 3173840711471, 28564566403241, 257081097629170, 2313729878662532

Offset

1,2

Links

Table of n, a(n) for n=1..17.

Index entries for linear recurrences with constant coefficients, signature (9,0,1,-9)

Formula

G.f.: x*(1+2*x+2*x^2) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015

Mathematica

With[{c=PadRight[{}, 21, {1, 2, 2}]}, Table[FromDigits[Take[c, n], 9], {n, 20}]] (* Harvey P. Dale, Feb 19 2012 *)

Crossrefs

Sequence in context: A045624 A125399 A163146 * A138894 A287832 A122105

Adjacent sequences: A037547 A037548 A037549 * A037551 A037552 A037553

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved