OFFSET
1,3
COMMENTS
Unique infinite word defined on alphabet {1,2} satisfying: a(1)=1, if a(n)=2 length of n-th run is 1, if a(n)=1 length of n-th run is 2. Kolakoski sequence satisfies the opposite definition: K(1)=1, if K(n)=2 length of n-th run is 2, if K(n)=1 length of n-th run is 1.
Equals A049705 without the first term. - Jean-Christophe Hervé, Nov 10 2014
EXAMPLE
a(1)=1 hence first run must have length 2 and necessarily a(2)=1. Now second run must also have length 2 and therefore a(3) = a(4) = 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Nov 17 2003
STATUS
approved