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!)
A111155 Smallest constant of a multiplicative bimagic square of order n. 0
120, 4320, 277200, 25945920, 3632428800, 670442572800, 140792940288000 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Clearly this is a number k that has n^2 distinct factors multiplying to give k^n. For all the values checked so far, it is the smallest such number.

LINKS

Table of n, a(n) for n=3..9.

Christian Boyer, The smallest possible multiplicative magic squares .

EXAMPLE

Examples of a 3 X 3 multiplicative bimagic square with constant 120 are

01 12 10

15 02 04

08 05 03

--------

01 20 06

12 02 05

10 03 04

--------

01 20 06

08 03 05

15 02 04

CROSSREFS

Sequence in context: A179060 A055360 A001807 * A283344 A223754 A174686

Adjacent sequences:  A111152 A111153 A111154 * A111156 A111157 A111158

KEYWORD

nonn

AUTHOR

Luke Pebody (ltp1000(AT)cam.ac.uk), Oct 20 2005

EXTENSIONS

More terms from David W. Wilson, Feb 02 2006

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 15:32 EST 2020. Contains 331998 sequences. (Running on oeis4.)