- Location
- Switzerland
- Name
- Matt
- Start Date
- Nov 16, 2020
- End Date
- Nov 16, 2020
A little maths trivia again: 13x13=169 - which is also true for the complete inversion of all the numbers involved: 31x31=961.
Neat
(btw. I could have used that for 144 already: 12x12=144; 21x21=441 - would have been less prone to a stumble than the "graphic" solution I chose.)
M.
Neat
(btw. I could have used that for 144 already: 12x12=144; 21x21=441 - would have been less prone to a stumble than the "graphic" solution I chose.)
M.