How to I right-justify exponents? {_{10}^{100}X}

[Christopher Reeve]

Hi,

I am using LyX 1.5.5 on a Mac OS 10.4

I need to write an equation with two leading exponents. E.g:

{_{10}^{1000}X}

This equation would look (roughly) like:

1000
10  X

But I need the numbers to fit snug against the X, e.g.

1000
  10X

Other people writing plain LaTeX do this. Any ideas?

Cheers,

Chris.