A008587 - OEIS

A008587

Multiples of 5: a(n) = 5 * n.

101

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 = 0.0322580645... = (1/2)^5 + (1/2)^10 + (1/2)^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 [math.CO], 2014-2015.

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

FORMULA

From R. J. Mathar, May 26 2008: (Start)

O.g.f.: 5x/(1-x)^2.

a(n) = A008706(n), n > 0. (End)

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

E.g.f.: 5*x*exp(x). - Stefano Spezia, Aug 19 2024