A248805 The difference A156257(n)-A074292(n).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Jean-Christophe Hervé, Oct 11 2014

Keywords

• sign

Comments

Related to the position and frequency of runs of length 2 in the Kolakoski sequence A000002.

Possible values are -1, 0, 1, and a 1 seems to be always followed soon by a -1, indicating that the two sequences A074292 and A156257 are not equal but rather close (this might help to show the equality of the proportions of 1 and 2 in the Kolakoski sequence).

Links

• Jean-Christophe Hervé, Table of n, a(n) for n = 1..5000

Crossrefs

Cf. A000002, A074292, A156257.

Programs

Maple

A248805 := proc(n)
    A156257(n)-A074292(n) ;
end proc:
seq(A248805(n),n=1..80) ; # R. J. Mathar, Nov 15 2014