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!)
A217854 Product of all divisors of n, positive or negative. 8
-1, 4, 9, -64, 25, 1296, 49, 4096, -729, 10000, 121, 2985984, 169, 38416, 50625, -1048576, 289, 34012224, 361, 64000000, 194481, 234256, 529, 110075314176, -15625, 456976, 531441, 481890304, 841, 656100000000, 961, 1073741824, 1185921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is negative iff n is a square.

LINKS

Table of n, a(n) for n=1..33.

FORMULA

a(n) = (-n)^tau(n) = (-n)^A000005(n).

CROSSREFS

Cf. A062758.

Sequence in context: A094083 A168251 A062758 * A028822 A270696 A069495

Adjacent sequences:  A217851 A217852 A217853 * A217855 A217856 A217857

KEYWORD

sign

AUTHOR

Franklin T. Adams-Watters, Oct 19 2012

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 February 17 18:14 EST 2020. Contains 332005 sequences. (Running on oeis4.)