A037630 Base-9 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,0.

2, 21, 189, 1703, 15330, 137970, 1241732, 11175591, 100580319, 905222873, 8147005860, 73323052740, 659907474662, 5939167271961, 53452505447649, 481072549028843, 4329652941259590

Offset

1,1

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*(2+3*x) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011

Mathematica

Table[FromDigits[PadRight[{}, n, {2, 3, 0}], 9], {n, 20}] (* Harvey P. Dale, Jan 19 2026 *)

Crossrefs

Sequence in context: A202028 A265167 A037749 * A037756 A037644 A381283

Adjacent sequences: A037627 A037628 A037629 * A037631 A037632 A037633

Keyword

nonn,base

Author

Clark Kimberling

Status

approved