Whatsapp Number Riddle: Find the Next Number in the Series

For the guys good with numbers here something you can ponder about.

Find the Next Number in the Series

2 = 5

3 = 10

4 = 17

5 = ??

So were you able to solve the riddle? Leave your answers in the comment section below.

You can check if your answer is correct by clicking on show answer below. If you get the right answer, please do share the riddle with your friends and family on WhatsApp, Facebook and other social networking sites.