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!)
A083094 Numbers k such that Sum_{j=0..k} (binomial(k,j) mod 3) is odd. 3
0, 8, 20, 24, 56, 60, 72, 80, 164, 168, 180, 188, 216, 224, 236, 240, 488, 492, 504, 512, 540, 548, 560, 564, 648, 656, 668, 672, 704, 708, 720, 728, 1460, 1464, 1476, 1484, 1512, 1520, 1532, 1536, 1620, 1628, 1640, 1644, 1676, 1680, 1692, 1700, 1944, 1952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Apparently a(n)/2 (mod 3) = A010060(n), the Thue-Morse sequence.

LINKS

Table of n, a(n) for n=1..50.

PROG

(PARI) isok(n) = sum(k=0, n, binomial(n, k) % 3) % 2; \\ Michel Marcus, Dec 05 2013

CROSSREFS

Cf. A010060, A051638, A083093, A083095.

Sequence in context: A205226 A205318 A100212 * A164916 A207190 A110116

Adjacent sequences:  A083091 A083092 A083093 * A083095 A083096 A083097

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 22 2003

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 29 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 06:02 EDT 2021. Contains 342935 sequences. (Running on oeis4.)