OFFSET
1,1
EXAMPLE
The Kolakoski sequence contains 10 distinct blocks of length 4; the last to appear is 2121, which appears for the first time beginning at position 19 of K (indexing starting at position 1), so a prefix of length 22 contains all 10 length-4 subwords.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jeffrey Shallit, Mar 09 2017
STATUS
approved