Orderby sequence in Query builder

Hi Team,

I need to sort page by custom property called  sequence.

I have created Custom property called sequence for page.

So that each page have custom property like page1 will have sequence number is 1

page 2 will have sequence number 2

for some page there won't be sequence number now i need to sort in such a way that the pages with have sequence number in  ascending order  and if page won't have sequence number it should come last.

Can some one help me with  predicate for sort in above manner.