It's a mathematical theory based on the infinity concept of declining numbers.
7 seconds sound clip from the The A-Team - The Rabbit Who Ate Las Vegas (Season 1, Ep. 7) TV Series.
You can hear this line at 00:05:44 in the DVD version of the movie.
Quote context
[...]
- We came to Los Angeles, and we've been trying to locate you.
- Yes, I talked to Mr.Lee. He told me you want us to rescue your friend, Bruce Warfel?
- It's a mathematical theory based on the infinity concept of declining numbers.
- Don't look at me. I always hit at 15, stand on 17.
- And then he just disappeared. The Xanadu Hotel doesn't even have a record of him ever staying there.
[...]