Question

What is the fourth term of this sequence?
(explanations appreciated!)

Answer 1

Forth term of the sequence is 61

Explanation:

Let's just go from a1 to a4:

a1 = 5

a2 = 2x5+3 = 13

a3 = 2x13+3 = 29

a4 = 2x29+3 = 61