Their highest common factor is 1
18 falls between 17 and 19.
The composite numbers between 11 and 19 are 12, 14, 15, 16 and 18
They are 15, 16, 17, 18 & 19.
19, 23, and 29
19, 23 and 29
They are: 18 and 19
The composite numbers between 11 and 19 are: 12 14 15 16 18 The other numbers, 11, 13, 17, and 19, are all prime.
The single number directly between those two numbers is 18.
They are: 12, 14, 15, 16 and 18
18.195, 18.3, 18.57936384648
There are nine numbers between 10 and 20: 11, 12, 13, 14, 15, 16, 17, 18, and 19.
12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers