Quote from: Creamy on Sat 13/10/2018 20:48:08
Do you know what's the answer for this one?
3968, 63, 8, 3, ...
Spoiler
You start from 2. Square it and then subtract 1. Square the result you got and then subtract 1 from it. Repeat as long as necessary.
So,
(2^2) -1 = 3,
(3^2) - 1 = 8,
(8^2) - 1 = 63,
(63^2) -1 = 3968
Just reverse this method, and you will have your answer. It's 2.
So,
(2^2) -1 = 3,
(3^2) - 1 = 8,
(8^2) - 1 = 63,
(63^2) -1 = 3968
Just reverse this method, and you will have your answer. It's 2.
[close]
Edit2: Put the answer in a spoiler. Thanks, Cassie.