What are the missing numbers in this sequence?

Question

1.25, 3.5, 8, 17, 35, 71, ___, ___, 575,...

Answer 1

Double the previous number and add 1.

(71 * 2) + 1 = ?

Answer 2

Great answer.

Look at my convoluting over-thinking on my part

http://www.jiskha.com/display.cgi?id=1352662242