Alphabet {0, 1, 4, 9, 18}
open No exhaustive search has settled this alphabet; the record below is a lower bound on the (possibly infinite) maximum.
Record word (length 1506, by David Renshaw, 2026-08-18)
Display: drawn for the equivalent alphabet translated by -6 (drift removed); downsampled ×2.
0 1 0 9 4 9 1 18 9 0 18 4 9 0 9 4 9 0 1 9 18 4 0 4 18 1 4 9 1 0 18 9 1 0 4 9 4 1 18 4 18 0 1 9 0 9 4 1 0 4 0 9 0 18 0 4 0 18 1 0 1 9 4 18 4 9 1 0 9 0 4 9 4 1 0 4 9 18 4 18 1 0 4 18 9 18 0 18 9 4 0 4 9 1 9 4 18 0 18 1 0 1 9 1 18 0 18 4 18 0 9 4 1 4 0 1 18 4 0 18 0 1 18 1 4 18 9 18 4 18 9 0 9 18 4 18 9 1 4 18 4 9 0 4 18 9 4 18 4 1 9 4 18 9 18 0 1 18 1 9 1 0 1 9 4 9 0 9 1 0 4 18 9 18 4 0 4 9 1 4 0 4 9 18 4 1 0 9 4 9 0 9 1 0 1 4 1 9 1 0 1 18 1 0 1 4 0 9 0 4 18 9 0 18 0 1 9 4 18 0 4 1 18 1 0 1 18 1 9 0 1 4 0 1 18 0 1 9 4 18 9 0 9 18 1 4 1 0 18 4 18 1 18 4 9 4 18 0 9 18 1 4 1 9 4 9 0 4 1 9 18 1 0 4 1 4 18 1 4 9 18 1 9 1 4 0 18 0 9 1 0 1 4 0 1 18 1 9 4 1 0 18 4 1 4 0 4 9 4 0 4 18 1 9 18 4 9 18 9 1 0 4 1 4 9 1 0 18 9 0 4 9 18 1 4 9 18 9 1 9 18 4 1 18 9 18 0 9 18 9 1 18 4 18 9 18 4 18 0 18 4 18 9 4 0 4 1 18 0 1 4 9 0 18 4 9 0 9 18 0 1 18 9 18 4 0 9 0 4 0 1 18 9 1 4 0 4 9 1 9 0 18 4 18 1 4 1 9 18 4 0 1 0 18 0 9 18 1 4 0 9 4 9 18 4 18 0 4 9 4 18 4 1 4 9 18 9 1 9 18 9 0 1 9 18 1 4 18 9 4 0 18 9 1 18 9 4 18 9 1 18 9 18 0 18 9 18 1 18 9 4 18 9 18 1 0 1 9 4 18 9 18 1 0 9 18 1 18 9 18 1 0 4 18 0 9 18 9 4 18 0 9 18 4 18 1 9 0 1 18 4 1 18 9 0 18 0 1 4 18 1 4 9 18 4 0 18 4 1 9 0 18 0 1 4 0 18 0 4 9 4 0 4 1 18 4 9 18 4 1 4 18 9 4 0 4 9 1 18 9 18 0 1 9 18 0 9 4 9 0 18 1 18 4 18 9 4 1 0 9 18 9 1 4 0 1 9 0 9 4 9 1 0 1 18 1 0 1 4 9 1 0 18 4 0 9 1 4 1 0 4 0 9 18 0 18 1 4 18 4 9 4 1 0 1 18 9 0 9 1 9 4 0 1 4 9 1 9 0 9 1 9 4 9 1 9 18 4 18 0 18 4 18 1 4 0 18 9 4 0 4 1 4 0 9 4 18 4 9 4 18 1 9 0 18 0 1 18 0 9 18 4 18 9 0 18 9 18 1 18 9 0 9 18 9 1 18 9 4 18 1 18 0 1 9 0 18 0 4 9 1 18 0 4 1 18 0 18 1 18 9 1 0 1 18 0 18 4 0 9 0 4 1 9 1 18 4 1 18 0 4 9 18 4 0 1 0 18 4 0 9 0 18 1 9 4 1 9 1 18 9 0 18 0 1 18 9 4 0 4 1 18 0 18 1 18 4 18 9 18 4 1 18 0 9 0 18 0 1 9 4 1 9 1 18 1 0 9 1 4 18 9 18 4 0 9 1 4 1 0 18 1 4 0 1 4 9 18 9 1 0 1 4 1 0 9 4 0 18 1 4 0 1 0 18 1 0 9 0 18 0 9 0 4 18 4 9 18 9 0 18 1 0 18 0 4 18 4 9 1 18 0 1 9 1 0 18 0 9 1 9 4 1 4 0 4 18 0 1 4 9 18 9 1 9 4 0 1 4 0 4 9 4 0 4 1 4 18 1 9 4 0 1 0 18 1 18 9 1 18 0 9 0 18 0 9 4 0 4 1 18 1 4 9 4 1 0 18 4 1 0 1 9 0 1 18 4 0 1 0 4 0 9 0 4 0 18 0 4 1 4 18 1 18 9 4 1 4 9 0 9 1 9 4 0 1 18 0 1 0 9 1 0 1 4 9 4 1 4 9 18 4 0 1 0 9 4 0 1 18 1 0 1 9 1 4 1 0 1 4 1 18 1 0 4 1 0 1 9 1 0 4 18 0 4 1 0 1 9 0 1 0 4 9 0 18 9 0 4 0 9 18 0 18 4 0 4 1 9 18 0 1 0 4 1 9 0 9 1 18 9 18 0 4 18 0 18 1 4 18 4 9 1 4 0 1 9 0 9 18 1 0 1 9 4 0 1 0 4 0 1 18 0 1 4 1 18 1 0 1 9 1 4 1 0 4 1 18 1 0 1 4 1 0 9 18 0 9 4 0 1 9 0 18 0 4 18 1 9 1 0 4 18 0 1 4 9 4 18 1 9 18 1 0 4 0 18 9 18 0 4 18 9 4 18 4 1 9 4 1 0 1 18 1 0 1 9 0 18 0 1 4 0 1 9 18 1 0 9 0 18 0 9 1 4 1 0 9 18 9 4 9 0 4 9 1 0 18 4 0 4 9 4 1 0 1 18 0 1 9 4 18 0 18 9 0 18 0 1 9 1 4 0 4 18 9 18 4 18 0 18 1 9 18 4 0 9 18 4 1 9 0 18 1 18 0 18 4 1 4 18 4 0 18 1 18 0 18 1 9 18 1 18 0 18 1 4 18 0 18 1 0 18 9 18 1 4 0 9 0 18 4 0 18 9 18 4 18 9 1 0 18 1 9 1 0 4 18 9 18 4 1 18 4 0 1 9 4 0 18 4 0 4 1 18 4 18 9 1 4 1 18 1 9 4 9 0 9 4 1 18 4 1 9 1 4 0 18 1 18 0 9 1 18 1 4 0 1 18 4 1 4 9 0 1 0 9 0 1 4 9 4 1 4 9 0 18 0 9 4 9 0 18 0 1 0 18 9 18 4 1 4 9 4 0 18 4 9 1 0 18 1 4 1 9 0 9 18 9 0 4 0 1 0 9 4 0 9 1 9 18 9 1 9 0 9 1 4 18 4 0 9 1 9 4 9 18 0 9 18 1 9 18 0 4 9 4 18 4 1 18 4 18 0 18 9 18 4 18 1 18 4 18 9 18 4 1 4 9 1 9 0 9 18 9 1 18 4 1 18 9 0 18 0 1 4 0 1 9 18 4 18 9 18 0 4 1 4 0 9 1 4 18 9 4 1 4 9 4 1 0 1 9 0 18 9 1 18 1 0 1 4 0 1 9 4
History
- 1506 (first) — David Renshaw, 2026-08-18