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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A070869 a(1) = 16; a(n+1) = sum of a(n) and (a(n) written in base 2 and reversed). 0
16, 17, 34, 51, 102, 153, 306, 459, 882, 1197, 2646, 4347, 11484, 15273, 24864, 25443, 50886, 76329, 152274, 229371, 458742, 688113, 1277910, 2162607, 6193008, 6684333, 12631680, 12729219, 25434054, 38529033, 76302162, 115562715 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 125.

LINKS

Table of n, a(n) for n=1..32.

EXAMPLE

To get a(2) note that 16 = 10000 in base 2, reversing gives 00001, or 1 and so a(2) = 16 + 1 = 17.

MATHEMATICA

a[1] = 16; a[n_] := Block[{b = IntegerDigits[ a[n - 1], 2]}, FromDigits[ b + Reverse[b], 2]]; Table[ a[n], {n, 1, 35}]

CROSSREFS

Sequence in context: A041514 A041512 A267029 * A101196 A064637 A115942

Adjacent sequences:  A070866 A070867 A070868 * A070870 A070871 A070872

KEYWORD

nonn,easy,base

AUTHOR

N. J. A. Sloane, May 19 2002

EXTENSIONS

More terms from Robert G. Wilson v, May 20 2002

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 22 10:07 EDT 2019. Contains 321421 sequences. (Running on oeis4.)