[texhax] Variable indentation of paragraph titles

[Rodolfo Medina]

Hi to all TeX users.

With plain TeX:
I wish to have something like that:


------------------------->%---------------------------------------------------

1. This is the title of paragraph 1, which is very very long, so I don't know
   how to handle it with TeX.

12. This is  the title of  paragraph 12, which has  a  different  indentation
    because of `12' in place of `1'.

-------------------------%<---------------------------------------------------


Can anybody suggest how to get that?  The title should be flush right; whereas
the number should be flush left; and the same glue should be between the number
and the title.

Thanks for any reply,
Rodolfo