1,1

Table of n, a(n) for n=1..52.

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.

Cf. A000002, A007782, A283511.

Sequence in context: A001005 A009735 A177245 * A137095 A092097 A195295

Adjacent sequences: A283508 A283509 A283510 * A283512 A283513 A283514

nonn

Jeffrey Shallit, Mar 09 2017

approved