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A008603 Multiples of 21. 7
0, 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 378, 399, 420, 441, 462, 483, 504, 525, 546, 567, 588, 609, 630, 651, 672, 693, 714, 735, 756, 777, 798, 819, 840, 861, 882, 903, 924, 945, 966, 987 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Tanya Khovanova, Recursive Sequences

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 333

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

FORMULA

G.f.: 21*x/(x-1)^2. - Vincenzo Librandi, Jun 10 2013

MATHEMATICA

Range[0, 1500, 21] (* Vladimir Joseph Stephan Orlovsky, Jun 01 2011 *)

CoefficientList[Series[21 x / (x - 1)^2, {x, 0, 60}], x] (* Vincenzo Librandi, Jun 10 2013 *)

PROG

(PARI) a(n)=21*n \\ Charles R Greathouse IV, Oct 07 2015

CROSSREFS

Cf. A008601, A008602.

Sequence in context: A037978 A089059 A114384 * A235497 A086794 A001682

Adjacent sequences:  A008600 A008601 A008602 * A008604 A008605 A008606

KEYWORD

nonn,easy,changed

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 27 18:30 EDT 2017. Contains 285528 sequences.