I couldn't find a course that had just numbers, so I made one. Please let me know if I've got something wrong, I'm not Irish so I'm just doing the best I can.
"a" is added before the number when counting aloud, but I have the base numbers set as alternate answers. Audio from http://radiolingua.com/shows/other-languages/one-minute-irish/
Welcome to Memrise!
Join millions of people who are already learning for free on Memrise! It’s fast, it’s fun and it’s mind-bogglingly effective.