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A008587 Multiples of 5. 76
0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

1/31 = .0322580645..., = .5^5 + .5^10 + .5^15 + ... - Gary W. Adamson, Mar 14 2009

Complement of A047201; A079998(a(n))=1; A011558(a(n))=0. - Reinhard Zumkeller, Nov 30 2009

The y-intercept of a line perpendicular to y=mx,where m is the slope a/b and in this case a=2 and b=1, is a^2+b^2 or 5, the first value of the list given. The remaining value are multiples of the first number of the list. - Larry J Zimmermann, Aug 21 2010

LINKS

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

Tanya Khovanova, Recursive Sequences

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 317

Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081, 2014

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

FORMULA

O.g.f.: 5x/(1-x)^2. a(n)=A008706(n), n>0. - R. J. Mathar, May 26 2008

a(n)=Sum_k>=0 {A030308(n,k)*A020714(k)}. - Philippe Deléham, Oct 17 2011.

MATHEMATICA

Range[0, 500, 5] (* Vladimir Joseph Stephan Orlovsky, May 26 2011 *)

PROG

(Maxima) makelist(5*n, n, 0, 20); /* Martin Ettl, Dec 17 2012 */

(MAGMA) [5*n: n in [0..60]]; // Vincenzo Librandi, Jun 10 2013

(PARI) a(n)=5*n \\ Charles R Greathouse IV, Mar 22 2016

CROSSREFS

Cf. index to numbers of the form n*(d*n+10-d)/2 in A140090.

Sequence in context: A092454 A248359 A008706 * A172336 A140233 A172328

Adjacent sequences:  A008584 A008585 A008586 * A008588 A008589 A008590

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 26 23:19 EDT 2017. Contains 284141 sequences.