CSS attribute selector efficient "greater than selector" code
You could always try something of the form

&lt;tag h="111" t="11111" o="1"&gt;


where you use your unary encoding for each of the hundreds (h), tens (t) and ones (o) attributes.

A greater-than CSS selector would then look like

tag[h^="1111"],tag[h="111"][t^="111111"],tag[h="111"][t="11111"][o^="1"] { ... }


but frankly, if your tags are just retaining some property that persists in spite of reordering, etc., why not just run a script that selects the last n marked tags on DOM load and assigns the class iamlast, then use the .iamlast CSS selector?