A212811 Iterate the morphism 1->1123, 2->223, 3->133 starting with 1.

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

Offset

1,3

Comments

This is an example of an infinite ternary sequence in which no three blocks occur consecutively which are permutations of each other.

Links

Table of n, a(n) for n=1..156.

F. M. Dekking, Strongly nonrepetitive sequences and progression-free sets, J. Combin. Theory Ser. A 27 (1979), no. 2, 181--185. MR0542527 (81b:05027).

Crossrefs

Cf. A212810.

Sequence in context: A007884 A190593 A276336 * A338854 A330957 A352924

Adjacent sequences: A212808 A212809 A212810 * A212812 A212813 A212814

Keyword

nonn

Author

N. J. A. Sloane, May 29 2012

Status

approved