Question

................ is a Unique Number

Answer 1

Step-by-step explanation:

4 is the only composite number n which doesn't divide (n-1)!

Answer 2

1729 is the natural number following 1728 and preceding 1730. It is known as the Hardy–Ramanujan number, after an anecdote of the British mathematician G. H. ... "No," he replied, "it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways."