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!)
A087734 a(n) = f(f(n)), where f() = A035327(). 3
0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 2, 3, 0, 1, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 0, 1, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 0, 1, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,11
LINKS
J.-P. Allouche and J. Shallit, The ring of k-regular sequences, II, Theoret. Computer Sci., 307 (2003), 3-29.
FORMULA
From Mikhail Kurkov, Sep 29 2019: (Start)
a(n) = n - Sum_{k=A063250(n)..A000523(n)} 2^k = n - 2^(A000523(n)+1) + 2^A063250(n) for n>0 with a(0)=0.
G.f.: 1/(1-x) * Sum_{j>=0} (2^j)*((x^(2^j))/(1+x^(2^j)) - (1-x^(2^j)) * Sum_{k>=1} x^((2^j)*(2^k-1))).
a(n) = 2*a(floor(n/2)) + n mod 2 - A036987(n) for n>1 with a(0)=a(1)=0.
a(n) = (1 - A036987(n-1))*(1 + A063250(n) - A063250(n-1))*(1 + a(n-1)) for n>0 with a(0)=0.
(End)
MAPLE
a:= n-> ((i->Bits[Nand](i$2))@@2)(n):
seq(a(n), n=0..100); # Alois P. Heinz, Sep 29 2019
MATHEMATICA
{0}~Join~Array[Nest[BitXor[#, 2^IntegerPart[Log2@ # + 1] - 1] &, #, 2] /. -1 -> 0 &, 81] (* Michael De Vlieger, Sep 29 2019 *)
CROSSREFS
Sequence in context: A342315 A063890 A156439 * A073644 A123343 A054439
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 01 2003
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 February 24 01:13 EST 2024. Contains 370288 sequences. (Running on oeis4.)