Here's a sequence I know of that offhand isn't obvious.
$0.14,0.14,3.28,3.28,9.57,3.28,9.57,3.28,9.57,15.85,3.28,15.85,...$
Keep in mind that this sequence originally looked like something else, but I did something to it.
I want to know what the sequence is (it's fairly well known), what the next $5$ numbers in the modified sequence are and finally, what I did to it to modify it.