I'm pretty sure the answer would be 1,2,4,16 (:
Chat with our AI personalities
We can't answer this accurately if you don't tell us the groups to choose from.
Nobody invented them, they are just names for numbers. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
The property of prime or composite is not defined for the number 1, just as it is not defined for any number that has a fractional part. There are no special names for numbers that are not prime nor composite.
fraction
A fraction names part of a region or part of a group. The top number of a fraction is called its numerator and the bottom part is its denominator. They are separated by a line called a "fraction bar."