A136441 Number of rotational symmetries in the binary expansion of a number with 0 appended to the front.

2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

0,1

Links

Gary Doran, Table of n, a(n) for n = 0..100

Example

a(0) = 2 because 00 has two rotational symmetries; a(21) = 3 because 010101 has 3 rotational symmetries.

Crossrefs

Cf. A138904.

Sequence in context: A025450 A139128 A106752 * A030561 A202053 A334184

Adjacent sequences: A136438 A136439 A136440 * A136442 A136443 A136444

Keyword

base,easy,nonn

Author

Max Sills, Apr 03 2008

Status

approved