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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181643 a(n) is the smallest value such that a(n)*[a(n)+n]*[a(n)+n+n]=y^2 is a perfect square 1
0, 0, 0, 0, 40, 6, 18, 0, 0, 0, 0, 0, 0, 4, 10, 0, 0, 0, 0, 5, 7, 0, 0, 1, 0, 0, 0, 72, 0, 15, 0, 0, 0, 128, 0, 0, 0, 0, 936, 0, 800, 0, 0, 0, 360, 196, 0, 0, 0, 0, 0, 0, 0, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

For a given n there is more than one solution.

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

a(5)=40 since 40*(40+5)*(40+5+5)=40*45*50=90000=300^2

CROSSREFS

Cf. A115878, A181646.

Sequence in context: A078084 A037937 A126652 * A117831 A152143 A277874

Adjacent sequences:  A181640 A181641 A181642 * A181644 A181645 A181646

KEYWORD

nonn

AUTHOR

Carmine Suriano, Nov 03 2010, corrected Nov 10 2010

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 April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)