A089842 - OEIS

A089842

Order of each element (row) in A089840, 0 if not finite.

1, 2, 2, 2, 3, 2, 3, 2, 2, 3, 2, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 4, 2, 2, 3, 2, 3, 2, 2, 3, 4, 3, 4, 2, 3, 3, 4, 2, 4, 2, 3, 2, 4, 3, 4, 2, 2, 3, 2, 3, 2, 2, 3, 4, 3, 4, 2, 3, 3, 4, 2, 4, 2, 3, 2, 4, 3, 4, 2, 2, 3, 2, 3, 2, 2, 3, 4, 3, 4, 2, 3, 3, 4, 2, 4, 2, 3, 2, 4, 3, 4, 2, 2, 3, 2, 3, 2, 2, 3, 4, 3, 4

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OFFSET

0,2

COMMENTS

If a(n) is nonzero, then the n-th non-recursive Catalan Automorphism in A089840 does not have orbits (cycles) larger than that and the corresponding LCM-sequence will set to a constant sequence a(n),a(n),a(n),a(n),... E.g. A089840[4] = A089851 is obtained by rotating three subtrees cyclically and its LCM-sequence begins as 1,1,1,3,3,3,3,3,3,3,3,... (a(4)=3). Similarly, A089840[15] = A089859, whose LCM-sequence begins as 1,1,2,4,4,4,4,4,4,4,4,.... (a(15)=4). In contrast, the Max. cycle and LCM-sequence (A089410) of A089840[12] (= A074679) exhibits genuine growth, thus a(12)=0.

LINKS

Table of n, a(n) for n=0..101.

A. Karttunen, C-program for computing the initial terms of this sequence

CROSSREFS

Note that the terms 1-23 of A060131: 2, 2, 3, 2, 3, 2, 2, 3, 4, 3, 4, 2, 3, 3, 4, 2, 4, 2, 3, 2, 4, 3, 4 repeat here at positions [22..44], [45..67], [68..90], [91..113], [114..136].

Sequence in context: A308641 A024676 A093429 * A258569 A091322 A252229

Adjacent sequences: A089839 A089840 A089841 * A089843 A089844 A089845

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 05 2003

STATUS

approved