login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A285053 Multiplications between idempotent equivalence classes for n X n matrices over GF(2). 0
1, 4, 118, 27080 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

With the n X n matrices over GF(2) construct 3-tuples (a,b,c) where a*b = c. Map each of the three elements to their idempotent under self multiplication. Filter on unique 3-tuples.

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

The idempotents are enumerated in A132186.

Sequence in context: A030255 A146508 A096464 * A264420 A283035 A284764

Adjacent sequences:  A285050 A285051 A285052 * A285054 A285055 A285056

KEYWORD

nonn,more

AUTHOR

Chad Brewbaker, Apr 08 2017

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 December 2 12:01 EST 2021. Contains 349440 sequences. (Running on oeis4.)