I have taken the following trivia and
quotes about mathematics from the book A
Passion for Mathematics, by Clifford A. Pickover, which I have mentioned in
another
post in this blog. These are the trivia:
- Let's
see four amazing properties of number 5: a) It is the hypotenuse of the smallest Pythagorean
triangle. b) There are five Platonic solids. c) It is the smallest automorphic
number. Automorphic numbers are those whose square ends in the
number. d) It is probably the only odd untouchable number.
Untouchable numbers are those that are not equal to the sum of the proper
divisors of any other number.
