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A172525 9*n*12345679. 1
111111111, 222222222, 333333333, 444444444, 555555555, 666666666, 777777777, 888888888, 999999999, 1111111110, 1222222221, 1333333332, 1444444443, 1555555554, 1666666665, 1777777776, 1888888887, 1999999998, 2111111109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

a(n) = 2*a(n-1)-a(n-2). - Colin Barker, Aug 20 2014

G.f.: 111111111*x / (x-1)^2. - Colin Barker, Aug 20 2014

MATHEMATICA

Table[9 n 12345679, {n, 1, 20}] (* Vincenzo Librandi, Aug 20 2014 *)

PROG

(MAGMA) [9*n*12345679: n in [1..20]]; // Vincenzo Librandi, Aug 20 2014

(PARI) Vec(111111111*x/(x-1)^2 + O(x^100)) \\ Colin Barker, Aug 20 2014

CROSSREFS

Cf. A021085.

Sequence in context: A094327 A180513 A202174 * A038451 A202082 A262499

Adjacent sequences:  A172522 A172523 A172524 * A172526 A172527 A172528

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 06 2010

STATUS

approved

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Last modified June 20 21:35 EDT 2021. Contains 345255 sequences. (Running on oeis4.)