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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082722 Numbers k for which there exist no palindromic 9-gonals (also known as nonagonals or enneagonals) of length k. 1
2, 6, 13, 14, 15, 16, 20, 25, 27, 28, 29, 30, 31, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Previous name was: There exist no palindromic nonagonals (enneagonals) of length n.

LINKS

Table of n, a(n) for n=1..14.

P. De Geest, Palindromic nonagonals

CROSSREFS

Cf. A034822, A059868, A082721, A059869, A059870, A034307.

Sequence in context: A116534 A130533 A231384 * A030416 A277690 A249342

Adjacent sequences:  A082719 A082720 A082721 * A082723 A082724 A082725

KEYWORD

nonn,base,hard

AUTHOR

Patrick De Geest, Apr 13 2003.

EXTENSIONS

Definition edited by Jon E. Schoenfield, Sep 15 2013

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified January 22 22:38 EST 2018. Contains 298093 sequences.