16. Interesting Numbers Hint for friendly numbers project: One number is between 200 and 224 and is even.


Hint for sociable numbers project: Start with 12,496. You should find 19 divisors which add to 14,288. The divisors of 14,288 add to give 15,572. The divisors of 15,572 add to give 14,536. This only leaves one number to find.


Rene Descartes: French academic, (1596–1650) Descartes left the military service to study philosophy and mathematics. He was first to use letters near the end of the alphabet for unknown values. He decided that x values should be on the horizontal axis and y values should be on the vertical axis. All points can be plotted as an ordered pair of numbers in co-ordinate geometry.


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