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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A285741 a(0) = 1; a(2*n) = a(n), a(2*n+1) = a(n) + R(a(n)), where R() is the digit reversal. 0
1, 2, 2, 4, 2, 4, 4, 8, 2, 4, 4, 8, 4, 8, 8, 16, 2, 4, 4, 8, 4, 8, 8, 16, 4, 8, 8, 16, 8, 16, 16, 77, 2, 4, 4, 8, 4, 8, 8, 16, 4, 8, 8, 16, 8, 16, 16, 77, 4, 8, 8, 16, 8, 16, 16, 77, 8, 16, 16, 77, 16, 77, 77, 154, 2, 4, 4, 8, 4, 8, 8, 16, 4, 8, 8, 16, 8, 16, 16, 77, 4, 8, 8, 16, 8, 16, 16, 77, 8, 16, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..90.

Michael Gilleland, Some Self-Similar Integer Sequences

Index entries for sequences related to Reverse and Add!

EXAMPLE

a(0) = 1;

a(1) = a(2*0+1) = a(0) + R(a(0)) = 1 + 1 = 2;

a(2) = a(2*1) = a(1) = 2;

a(3) = a(2*1+1) = a(1) + R(a(1)) = 2 + 2 = 4;

a(4) = a(2*2) = a(2) = 2;

a(5) = a(2*2+1) = a(2) + R(a(2)) = 2 + 2 = 4, etc.

MATHEMATICA

a[0] = 0; a[n_] := If[EvenQ[n], a[n/2], a[(n - 1)/2] + FromDigits[Reverse[IntegerDigits[a[(n - 1)/2]]]] ]; Table[a[n], {n, 0, 90}]

CROSSREFS

Cf. A001127 (records), A004086, A056964.

Sequence in context: A054536 A293664 A001316 * A161831 A096865 A116466

Adjacent sequences:  A285738 A285739 A285740 * A285742 A285743 A285744

KEYWORD

nonn,base

AUTHOR

Ilya Gutkovskiy, Apr 25 2017

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 February 24 05:48 EST 2018. Contains 299597 sequences. (Running on oeis4.)