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A037624
Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,0,3.
3
2, 20, 203, 2032, 20320, 203203, 2032032, 20320320, 203203203, 2032032032, 20320320320, 203203203203, 2032032032032, 20320320320320, 203203203203203, 2032032032032032, 20320320320320320, 203203203203203203, 2032032032032032032, 20320320320320320320
OFFSET
1,1
FORMULA
G.f.: x*(2+3*x^2) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011
MATHEMATICA
CoefficientList[Series[(2 + 3 x^2) / ((x - 1) (10 x - 1) (1 + x + x^2)), {x, 0, 20}], x] (* Vincenzo Librandi, Feb 16 2018 *)
Table[FromDigits[PadRight[{}, n, {2, 0, 3}]], {n, 20}] (* Harvey P. Dale, Jul 29 2024 *)
PROG
(Magma) I:=[2, 20, 203, 2032]; [n le 4 select I[n] else 10*Self(n-1)+Self(n-3)-10*Self(n-4): n in [1..30]]; // Vincenzo Librandi, Feb 16 2018
CROSSREFS
Sequence in context: A037722 A109107 A037729 * A077327 A173499 A067636
KEYWORD
nonn,base
STATUS
approved