Sequence of 9 Numbers: Find the Sequence

What is a Sequence Finder puzzle? You are given some numbers in a row and you must find the next number in sequence. Do you think that is easy? No, it's not! Example Question ? 72, 143, 285, 569, 1137, 2273 ____ Solution: 72, 143, 285, 569, 1137, 2273, 4545