login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A278564 Irregular triangle read by rows: row n lists (negated) determinants of the quadratic Farey series of order n. 0
1, 1, 3, 1, 1, 2, 3, 2, 1, 1, 2, 3, 1, 5, 1, 3, 2, 1, 1, 2, 2, 3, 2, 5, 2, 3, 2, 2, 1, 1, 2, 2, 3, 1, 4, 2, 1, 7, 1, 2, 4, 1, 3, 2, 2, 1, 1, 2, 2, 2, 3, 1, 5, 1, 2, 1, 7, 1, 2, 1, 5, 1, 3, 2, 2, 2, 1, 1, 2, 2, 2, 3, 1, 4, 2, 5, 2, 3, 1, 1, 9, 1, 1, 3, 2, 5, 2, 4, 1, 3, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 1, 4, 2, 1, 6, 2, 3, 2, 1, 9, 1, 2, 3, 2, 6, 1, 1, 2, 4, 1, 3, 2, 2, 2, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,3
LINKS
H. Brown, K. Mahler, A generalization of Farey sequences: Some exploration via the computer, Journal of Number Theory 3.3 (1971): 364-370.
EXAMPLE
Triangle begins:
1,
1,3,1,
1,2,3,2,1,
1,2,3,1,5,1,3,2,1,
1,2,2,3,2,5,2,3,2,2,1,
1,2,2,3,1,4,2,1,7,1,2,4,1,3,2,2,1,
1,2,2,2,3,1,5,1,2,1,7,1,2,1,5,1,3,2,2,2,1,
1,2,2,2,3,1,4,2,5,2,3,1,1,9,1,1,3,2,5,2,4,1,3,1,1,1,1,
1,2,2,2,2,3,1,4,2,1,6,2,3,2,1,9,1,2,3,2,6,1,1,2,4,1,3,2,2,2,2,1,
...
CROSSREFS
Sequence in context: A243925 A348282 A030727 * A269973 A128316 A065836
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, Nov 25 2016
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)