"Lost Days 2022" appears to be a calendar for the coming year. But each month has some dates missing, or “lost”, defined by different mathematical series and simple code messages. January is missing prime numbers, February factors of 28, March the Fibonacci series, etc. Maybe you know someone who is mathematical and needs a Christmas present! Packs flat and comes in an envelope with a key explaining the mathematical series or code messages used. Uses my "castellated spine" structure. £22 + p/p
28.09 | 17:52
Yes, the 2022 edition is on the What’s New page.
09.09 | 19:10
Are you doing a 2022 version?
10.12 | 09:26
Apologies for looking a bit vague yesterday at Ardvaak. It was good to see you again. We always seem to be away when you are exhibiting these days.I must look more closely at your web page to see wher