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!)
A342224 The n-th and a(n)-th points of the curve (A334474, A334475) are symmetrical with respect to the line X=Y. 3
0, 2, 1, 3, 8, 9, 7, 6, 4, 5, 15, 11, 14, 13, 12, 10, 31, 32, 30, 29, 33, 35, 34, 28, 27, 26, 25, 24, 23, 19, 18, 16, 17, 20, 22, 21, 63, 62, 59, 58, 60, 61, 42, 44, 43, 47, 46, 45, 57, 55, 56, 51, 54, 53, 52, 49, 50, 48, 39, 38, 40, 41, 37, 36, 121, 122, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
In other words, a(n) is the unique k such that A334474(n) = A334475(k) and A334474(k) = A334475(n).
This sequence is a self-inverse permutation of the nonnegative integers.
LINKS
FORMULA
a(n) < A007582(k) for any n < A007582(k).
EXAMPLE
The curve (A334474, A334475) begins as follows on a hexagonal lattice:
+
/5\
/ \
+4 +6
\ \
\ \
+ 3+ +7
/1\ / /
/ \ / /
+ + +----+
0 2 8 9
- so a(0) = 0,
a(1) = 2,
a(3) = 3,
a(4) = 8,
a(5) = 9,
a(6) = 7.
PROG
(PARI) See Links section.
CROSSREFS
See A342217 and A342218 for similar sequences.
Sequence in context: A352858 A078045 A202624 * A145490 A329180 A302544
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Mar 06 2021
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 February 21 06:00 EST 2024. Contains 370219 sequences. (Running on oeis4.)