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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A327825 "Rotation" of n: swap the first [d/2] and last [d/2] digits, when n has d digits. 0
979, 89, 189, 289, 389, 489, 589, 689, 789, 889, 989, 99, 199, 299, 399, 499, 599, 699, 799, 899, 999, 10, 110, 210, 310, 410, 510, 610, 710, 810, 910, 1010, 1110, 1210, 1310, 1410, 1510, 1610, 1710, 1810, 1910, 2010, 2110, 2210, 2310, 2410, 2510, 2610, 2710, 2810, 2910, 3010, 3110, 3210 (list; graph; refs; listen; history; text; internal format)
OFFSET

979,1

COMMENTS

When n has an odd number of digits, the middle one remains at its place.

This operation, denoted "rotation" k -> rot(k) in sequences A086002, A086003, A086004, is indistinguishable from A004086 (reverse n) for numbers < 1000. Therefore the offset is chosen as to have 2/3 of the displayed terms beyond this limit and 1/3 below. This makes it easy to find the sequence searching for the terms near that limit, ..., 999, 10, 110, 210,....

LINKS

Table of n, a(n) for n=979..1032.

FORMULA

a(n) = A004086(n) ("reverse n") for n < 1000.

EXAMPLE

a(123) = concat(3, 2, 1) = 321.

a(1234) = concat(34, 12) = 3412.

a(12345) = concat(45, 3, 12) = 45312.

PROG

(PARI) a(n)={n=digits(n); fromdigits(concat([n[#n\/2+1..#n], n[#n\2+1..#n\/2], n[1..#n\2]]))}

CROSSREFS

Cf. A086002, A086003, A086004, A004086.

Sequence in context: A063052 A231708 A172158 * A108904 A091080 A157515

Adjacent sequences:  A327822 A327823 A327824 * A327826 A327827 A327828

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Sep 26 2019

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 8 01:34 EST 2019. Contains 329850 sequences. (Running on oeis4.)