On Tue, Mar 13, 2018 at 2:54 AM, Robin Becker <robin at reportlab.com> wrote: > On 12/03/2018 13:17, Robin Becker wrote: > An alternative approach gives more orderly sequences using a variable base > number construction > >> 4 (0, 0, 1) >> 9 (0, 0, 1) >> 18 (0, 0, 2) >> 32 (0, 0, 2) I spy duplicates. ChrisA