Martin Gardner passed away yesterday (May 22) at the age of 95 — a number that is 0 mod 1, 1 mod 2, 2 mod 3, and 3 mod 4, as I’m sure he’d appreciate. It seems like half the puzzles I hear about were either invented by him or popularized by him. Falling into the latter category are the flexagons, which are, of course, a favorite of Godzilla and which were described in the first “Mathematical Games” column of Scientific American (you know, according to Wikipedia).
A quick search reveals lots of puzzles, most of which have a visual component. As a treat, here’s a quick one that doesn’t (from the group Gathering for Gardner):
- Write out the alphabet starting at J (and ending at I):
Now erase all the letters that have vertical symmetry, like M.
There will be 5 groups of consecutive letters left. Write the number of letters in each group:
___ ___ ___ ___ ___
Scientific American itself just posted 3 Gardner puzzles here in tribute to the man who served them well for many years.
Martin, thanks for the fun.
The photo of Martin Gardner was taken by Konrad Jacobs of Erlangen and is licensed under CC. From Wikipedia.