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A091959 a(1)=1, a(2n)=(a(n)+1) mod 2, a(2n+1)=2*a(2n)+1. 0
1, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 0, 1, 0, 1, 1, 3, 0, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

If we replace 3's by 1's we get A035263.

LINKS

Table of n, a(n) for n=0..104.

FORMULA

a(A036554(n))=0; a(2*A036554(n)+1)=3 otherwise a(n)=1

PROG

(PARI) a(n)=if(n<2, 1, if(n%2, 2*a(n-1)+1, (a(n/2)+1)%2))

CROSSREFS

Sequence in context: A292835 A140807 A232629 * A046094 A055976 A293305

Adjacent sequences:  A091956 A091957 A091958 * A091960 A091961 A091962

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 13 2004

STATUS

approved

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Last modified February 20 01:06 EST 2018. Contains 299357 sequences. (Running on oeis4.)