login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098971 a(0)=1; for n > 0, a(n)=a(floor(n/2))+2*a(floor(n/4)). 0
1, 3, 5, 5, 11, 11, 11, 11, 21, 21, 21, 21, 21, 21, 21, 21, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 171, 171, 171, 171, 171 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
n>0, a(n)=(1/3)*(8*2^(floor(log(n)/log(2)))+(-1)^(floor(log(n)/log(2))))
PROG
(PARI) a(n)=if(n<1, 1, (1/3)*(8*2^(floor(log(n)/log(2)))+(-1)^(floor(log(n)/log(2)))))
CROSSREFS
a(2^n) gives the Jacobsthal sequence A001045(n+3).
Sequence in context: A190864 A155537 A164663 * A093572 A317650 A240731
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Oct 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)