mysql - Does anyone know how to Stuff in groups?

I am trying to use the stuff function in MS SQL to stuff certain info. Here is the example:

Number          Value 
1                 1
2                 1
3                 1
1                 2

2                 2
3                 2
1                 3
2                 3

I would like to stuff the column so that only one record will display as following:

Value             Number
1                 1,2,3

2                 1,2,3
3                 1,2

Please note that there are a like n-Numbers and n-Values.