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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087801 Greatest common divisor of tau(n)+sigma(n) and tau(n)*sigma(n), where tau=A000005 and sigma=A000203. 0
1, 1, 2, 1, 4, 16, 2, 1, 1, 2, 2, 2, 4, 4, 4, 1, 4, 9, 2, 12, 4, 8, 2, 4, 1, 2, 4, 2, 4, 16, 2, 3, 4, 2, 4, 1, 4, 16, 4, 2, 4, 8, 2, 18, 12, 4, 2, 2, 3, 9, 4, 4, 4, 64, 4, 64, 4, 2, 2, 36, 4, 4, 2, 1, 8, 8, 2, 12, 4, 8, 2, 9, 4, 2, 2, 2, 4, 16, 2, 4, 1, 2, 2, 4, 16, 8, 4, 4, 4, 6, 4, 6, 4, 4, 4, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(n) = GCD(A007503(n), A064840(n)).

LINKS

Table of n, a(n) for n=1..96.

CROSSREFS

Cf. A009205, A009191, A009194.

Sequence in context: A162977 A032174 A212267 * A238454 A025228 A132945

Adjacent sequences:  A087798 A087799 A087800 * A087802 A087803 A087804

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 11 2003

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 April 23 12:03 EDT 2014. Contains 240919 sequences.