366?, Maths
259: What’s special about the number 259?
Plenty: 259=3²+5²+15²= 3²+9²+13² so, it can be expressed as the sum of three distinct squares in two different ways. It can be expressed as the sum of four cubes in two different ways. 259=2³+2³+3³+6³=1³+2³+5³+5³. It is semi-prime in that it is a number that is the product of two distinct primes: 7×37. I have had another […]