login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092338 Number of numbers d with n mod d <= 1. 1
1, 2, 3, 4, 4, 5, 5, 5, 6, 6, 5, 7, 7, 5, 7, 8, 6, 7, 7, 7, 9, 7, 5, 9, 10, 6, 7, 9, 7, 9, 9, 7, 9, 7, 7, 12, 10, 5, 7, 11, 9, 9, 9, 7, 11, 9, 5, 11, 12, 8, 9, 9, 7, 9, 11, 11, 11, 7, 5, 13, 13, 5, 9, 12, 10, 11, 9, 7, 9, 11, 9, 13, 13, 5, 9, 11, 9, 11, 9, 11, 14, 8, 5, 13, 15, 7, 7, 11, 9, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

G.f.: x^2/(x - 1) + ((1 + x)*(log(1 - x) + psi(1, x)))/log(x)  where psi(1,x) is the logarithmic derivative of the x-gamma function at z=1. Olivier Gérard, Jun 24 2012

PROG

(Haskell)

a092338 n = length $ filter (<= 1) $ map (mod n) [1..n]

-- Reinhard Zumkeller, Jul 04 2012

CROSSREFS

Sequence in context: A249041 A070546 A034586 * A199769 A030601 A049839

Adjacent sequences:  A092335 A092336 A092337 * A092339 A092340 A092341

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 18 2004

EXTENSIONS

Wrong comment removed by Reinhard Zumkeller, Jul 04 2012

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified November 20 15:32 EST 2014. Contains 249751 sequences.