What does the below image rebus riddle means ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Which English verb becomes past tense just by rearranging the letters?

Count the squares in the matchstick puzzle below?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?