A080586 A run of 3*2^n 1's followed by a run of 3*2^n 2's, for n=0, 1, 2, ...

1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

0,4

Links

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

Formula

a(n) = ( 3 - (-1)^A079944(A002264(n)) )/2, A079944(A002264(n))=floor(log[2](4*(floor((n+6)/3))/3)) - floor(log[2](floor((n+6)/3))) - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Feb 24 2003

Also a(n) = 1+A079944(A002264(n))=floor(log[2](8*(floor((n+6)/3))/3)) - floor(log[2](floor((n+6)/3))) - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Feb 24 2003

Maple

f := (c, n)->seq(c, i=1..3*2^n); [f(1, 0), f(2, 0), f(1, 1), f(2, 1), f(1, 2), f(2, 2), f(1, 3), f(2, 3)]; f;

Mathematica

Flatten[Table[{PadRight[{}, 3*2^n, 1], PadRight[{}, 3*2^n, 2]}, {n, 0, 4}]] (* Harvey P. Dale, May 04 2014 *)

Crossrefs

Cf. A079948, A080587.

Equals 1 + A080584.

Sequence in context: A102679 A025146 A067397 * A152906 A128522 A025454

Adjacent sequences: A080583 A080584 A080585 * A080587 A080588 A080589

Keyword

nonn

Author

N. J. A. Sloane, Feb 23 2003

Status

approved