A066672 Exponents of powers of 2 displayed in A066671: 2^a(n) is the largest even divisor of A066669(n).

1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 2, 3, 2, 3, 3, 2, 2, 3, 1, 1, 2, 3, 2, 3, 3, 2, 1, 4, 2, 2, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 2, 1, 5, 3, 4, 4, 2, 1, 3, 4, 4, 3, 3, 1, 5, 4, 4, 3, 3, 2, 4, 2, 4, 4, 2, 3, 5, 4, 3, 4, 4, 1, 1, 4, 2, 3, 4, 2, 3, 1, 4, 3, 5, 2, 6, 5, 5, 4, 5, 5, 4, 3, 1, 4, 6, 5, 4, 1, 3, 4, 3

Offset

1,4

Links

Table of n, a(n) for n=1..105.

Example

A066669(263) = 769 and phi(769) = 768 = 3*256, so a(263) = log_2(256) = log_2(phi(769)/3) = log_2(phi(A066669(263))/A066670(263)) = 8.

Crossrefs

Cf. A000010, A066669-A066672.

Sequence in context: A025849 A088782 A291984 * A134024 A161069 A161108

Adjacent sequences: A066669 A066670 A066671 * A066673 A066674 A066675

Keyword

nonn

Author

Labos Elemer, Dec 18 2001

Status

approved