A138006 Length of all the nontrivial cycles of the Ducci map for n in A138004.

3, 15, 7, 341, 819, 9709, 2047, 475107, 31, 3233097, 5461, 8388607, 3556769739, 31675383749, 65498251203, 575525617597, 34359738367, 549755813887, 182518930210733, 2047, 37905296863701641, 2251799813685247

Offset

1,1

Comments

It appears that the maximum possible cycle length is n*(2^((n-1)/2)-1).

Links

Table of n, a(n) for n=1..22.

Crossrefs

Cf. A135546.

Sequence in context: A102777 A102531 A135546 * A335696 A256557 A337471

Adjacent sequences: A138003 A138004 A138005 * A138007 A138008 A138009

Keyword

nonn

Author

T. D. Noe, Feb 26 2008

Status

approved