OR-Library is a collection of test data sets for a variety of OR problems.
A full list of the test data sets available in OR-Library can be found here.
There are currently 4 data files.
These data files are the test problems used in: "A formulation space search heuristic for packing unequal circles in a fixed size circular container" by C.O. Lopez and J.E. Beasley, European Journal of Operational Research vol.251, no.1, 2016, pp64-73.
The test problems are the files: circle1, circle2, circle3, circle4. The format of these data files is: number of circles (n), 3 values for the container radius for circle i (i=1,2,...,n) in turn: circle radius
Click here to access these files