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A008606 Multiples of 24. 20
0, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240, 264, 288, 312, 336, 360, 384, 408, 432, 456, 480, 504, 528, 552, 576, 600, 624, 648, 672, 696, 720, 744, 768, 792, 816, 840, 864, 888, 912, 936, 960, 984, 1008, 1032, 1056, 1080, 1104, 1128, 1152, 1176, 1200 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

If n is a multiple of 24, also the sum of the divisors of n-1 is a multiple of 24. - Vincenzo Librandi, Apr 12 2014

This is the sequence of numbers n such that A259748(n)/n = 11/12. - Danny Rorabaugh, Oct 22 2015

LINKS

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

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Tanya Khovanova, Recursive Sequences

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 336 [broken link]

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

FORMULA

G.f.: 24*x/(1-x)^2. - Vincenzo Librandi, Jun 11 2013

a(n) = 24*A001477(n) - Danny Rorabaugh, Oct 24 2015

MATHEMATICA

Range[0, 1500, 24] (* Vladimir Joseph Stephan Orlovsky, Jun 01 2011 *)

CoefficientList[Series[24 x / (x - 1)^2, {x, 0, 60}], x] (* Vincenzo Librandi, Jun 11 2013 *)

PROG

(PARI) a(n)=24*n \\ Charles R Greathouse IV, Sep 24 2015

CROSSREFS

Cf. A008604, A008605.

Sequence in context: A257861 A050497 A162282 * A141767 A280097 A183008

Adjacent sequences:  A008603 A008604 A008605 * A008607 A008608 A008609

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 26 18:46 EDT 2017. Contains 284137 sequences.