it is 21?
It is a prime number
Number Theory
the main branches of mathematics are algebra, number theory, geometry and arithmetic.
The number "167" comes from mathematics. It is a natural that precedes 168 and follows 166. It is regarded as a "Chen prime" number in the field of mathematics.
There is no such thing in mathematics as a "neither" number.
7
It is: 7
510
unity
3
It means "number."