A Recursive Block Pillar Structure in the Kolakoski Sequence K(1,3)

Abstract

The Kolakoski sequence K(1,3) over {1, 3} is known to be structured, unlike K(1,2), with symbol frequency d approx. 0.397 linked to the Pisot number alpha (real root of x^3 - 2x^2 - 1 = 0). We reveal an explicit nested recursion defining block sequences B(n) and pillar sequences P(n) via B(n+1) = B(n) P(n) B(n) and P(n+1) = G(R(P(n)), 3), where G generates runs from vector R(P(n)). We prove B(n) are prefixes of K(1,3) converging to it, and B(n+1) = G(R(B(n)), 1), directly reflecting the Kolakoski self-encoding property. We derive recurrences for lengths |B(n)|, |P(n)| and symbol counts, confirming growth governed by alpha (limit |B(n+1)|/|B(n)| = alpha as n -> infinity). If block/pillar densities converge, they must equal d. This constructive framework provides an alternative perspective on K(1,3)'s regularity, consistent with known results from substitution dynamics.