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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110724 {n concatenate R(n)} + {R(n) concatenate n}, where R(n) = digit reversal of n. 4
0, 22, 44, 66, 88, 110, 132, 154, 176, 198, 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 12221, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 12221, 13332, 4444, 5555, 6666 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

FORMULA

When n has one digit, a(n)=22*n. When n has two digits, a(n)= 1111*x + 1111*y. (Here x,y are the digits of n.) - Keith Schneider, Jun 16 2007

EXAMPLE

a(12) = 1221 + 2112 = 3333.

a(68) = 6886 + 8668 = 15554.

MATHEMATICA

Table[FromDigits[Join[IntegerDigits[n], Reverse[IntegerDigits[n]]]] + FromDigits[Join[Reverse[IntegerDigits[n]], IntegerDigits[n]]], {n, 0, 50}] (* Stefan Steinerberger, Jun 17 2007 *)

CROSSREFS

Cf. A110722, A110723, A110725.

Sequence in context: A269310 A015799 A008604 * A277051 A308125 A061832

Adjacent sequences:  A110721 A110722 A110723 * A110725 A110726 A110727

KEYWORD

base,easy,nonn,less

AUTHOR

Amarnath Murthy, Aug 09 2005

EXTENSIONS

Corrected and extended by Stefan Steinerberger, Jun 17 2007

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 August 19 18:33 EDT 2019. Contains 326133 sequences. (Running on oeis4.)