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

Can you identify the hidden rebus in the image below?

There are five men, let's say Tarun Harish Lavesh, Manoj, and Manish. All of them have a dot mark on their forehead. They can't see the dots on their forehead but can see the ones on others. The owner of WHITE Dot is an honest person and will never lie, while the owner of BLACK Dot always tells the lie.

This is the statement from Tarun Harish Lavesh and Manish:
Tarun: 'I see 3 whites and 1 black'
Harish: 'I see 4 black'
Lavesh: 'I see 3 black and 1 white'
Manish: 'I see 4 white'

What colour is the dot on each of Tarun Harish Lavesh, Manoj, and Manish's forehead?

What is red and smells like blue paint?

When is the top of a mountain similar to a savings account?

If 1+9+8=1, what is 2+8+9?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Count the number of triangles in the given picture.

Find the number of squares in the below picture

Can you name some countries which do not have the alphabet 'A' in them?