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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A033635 Square-root-perfect numbers: srsigma(n)=m*n^(1/2) for some integer m. 1
4, 64, 48400, 37822470400, 6935904849126400, 11883371958374400, 62796991981158400, 87762493613171048488960000, 874812594495483490385610887270400000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

FORMULA

If n = Product p(i)^r(i) then srsigma(n) = Product [ (p(i)^(r(i)/2+1/2)-1)/(p(i)^(1/2)-1) ].

CROSSREFS

Sequence in context: A120581 A146520 A030176 * A138835 A234608 A119601

Adjacent sequences:  A033632 A033633 A033634 * A033636 A033637 A033638

KEYWORD

nonn

AUTHOR

Yasutoshi Kohmoto

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 22 14:32 EDT 2019. Contains 323480 sequences. (Running on oeis4.)