Write down separately the prime and composite numbers less than 20.
Prime numbers less than 20 are
2, 3, 5, 7, 11, 13, 17, 19
Composite numbers less than 20 are
4, 6, 8, 9, 10, 12, 14, 15, 16, 18
Question 4
Question 9
Write seven consecutive composite numbers less than 100 so that there is no prime number between them.