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

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Next Number in the Series,

5, 16, 49, 104, ?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What does this below rebus puzzle mean?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Can you replace the question mark with the correct number?