login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083447 a(n) = floor( n*R(n)/(n+R(n))), where R(n) is the digit reversal of n (A004086). 1
1, 1, 2, 2, 3, 3, 4, 4, 0, 5, 7, 9, 10, 11, 12, 13, 14, 15, 1, 7, 11, 13, 15, 16, 18, 19, 20, 22, 2, 9, 13, 16, 18, 21, 22, 24, 26, 27, 3, 10, 15, 18, 22, 24, 26, 28, 30, 32, 4, 11, 16, 21, 24, 27, 30, 32, 34, 36, 5, 12, 18, 22, 26, 30, 33, 35, 37, 40, 6, 13, 19, 24, 28, 32, 35, 38, 41 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 2..1000

EXAMPLE

a(17) = floor(17*71/(17+71)) = floor(1207/88) = 13.

MATHEMATICA

drev[n_]:=Module[{dr=FromDigits[Reverse[IntegerDigits[n]]]}, Floor[ (dr*n)/ (dr+n)]]; Array[drev, 80, 2] (* Harvey P. Dale, Apr 26 2014 *)

CROSSREFS

Sequence in context: A304706 A084054 A106747 * A252489 A332250 A059998

Adjacent sequences:  A083444 A083445 A083446 * A083448 A083449 A083450

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 01 2003

EXTENSIONS

More terms from Jason Earls, May 23 2004

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 March 29 15:03 EDT 2020. Contains 333107 sequences. (Running on oeis4.)