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!)
A105591 a(n)=n+2-sum{k=0..n, -mu(k-mod(k^5,5k))} 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

COMMENTS

A Moebius quintuple count.

Numbers appear in quintuples or multiples of quintuples.

LINKS

Table of n, a(n) for n=0..82.

CROSSREFS

Sequence in context: A213809 A204854 A113215 * A130497 A178154 A270774

Adjacent sequences:  A105588 A105589 A105590 * A105592 A105593 A105594

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Apr 14 2005

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 May 17 12:55 EDT 2021. Contains 343971 sequences. (Running on oeis4.)