“…Take the numeration system of Example 5. If we compute ν 2 (U i ), the values for 41 ≤ i ≤ 60 are given by 24,20,21,21,24,22,23,23,27,24,25,25,28,26,27,27,33,28,29,29 and, similarly, for ν 3 (U i ) 13, 14, 14, 14, 15, 15, 15, 16, 17, 16, 17, 17, 17, 18, 18, 18, 19, 20, 19, 20. Hence, one can conjecture that α 1 = 1 2 and α 2 = 1 3 . The recurrence has a real dominant root β ≃ 12.554.…”