The next number in the sequence is 19.
This sequence consists of prime numbers, which are numbers greater than 1 that have no divisors other than 1 and themselves. The numbers listed are all prime:
- 2
- 3
- 5
- 7
- 11
- 13
- 17
After 17, the next prime number is 19. Prime numbers are important in number theory and have unique properties that make them essential in various fields, including cryptography.