A212810 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A212810

Iterate the morphism 1->122, 2->1112 starting with 1.

1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 1, 2, 1, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..1531

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

EXAMPLE

1 -> 122 -> 122 1112 1112 -> ...

CROSSREFS

Cf. A212811.

Sequence in context: A278514 A243840 A117898 * A072344 A140500 A156054

Adjacent sequences: A212807 A212808 A212809 * A212811 A212812 A212813

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 29 2012

STATUS

approved

Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.