login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A244328 a(1) = a(2) = 0; for n >= 3: a(n) = floor((n*(n+1)/2) / antisigma(n)) = floor(A000217(n) / A024816(n)). 3
0, 0, 3, 3, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..87.

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

FORMULA

a(n) = 1 for n >= 7.

a(n) = A244327(n) - A244329(n) for n >= 7.

EXAMPLE

For n = 10; a(10) = floor(A000217(10) / A024816(10)) = floor(55 / 37) = 1.

PROG

(MAGMA) [Floor((n*(n+1)div 2) div ((n*(n+1)div 2)-SumOfDivisors(n))): n in [3..1000]]

(PARI) if(n>6, 1, [0, 0, 3, 3, 1, 2][n]) \\ Charles R Greathouse IV, May 15 2015

CROSSREFS

Cf. A000203, A000217, A024816, A244327, A244329.

Sequence in context: A173503 A100940 A063421 * A073067 A003637 A317413

Adjacent sequences:  A244325 A244326 A244327 * A244329 A244330 A244331

KEYWORD

nonn,easy

AUTHOR

Jaroslav Krizek, Jul 08 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 5 08:01 EDT 2020. Contains 335464 sequences. (Running on oeis4.)