If I'm understanding you correctly the numbers that you mentioned 1,2,3,4,5,6,7 represents the notes that you play on the keyboard. For example
Key of C
C D E F G A B C
1 2 3 4 5 6 7 1
For more info on the number stop by the General Music Hangout and click on the thread at the very top that says "LGM Ultimate Theory Collection" or something like that. I hope this helps, if you have any more questions don't hesitate to ask. God bless!