String.Format Won't Accept Integer from List

Can somebody help explain why I'm getting an error when I try to composite format an item from a list into a string?

int[] locationList = new int[] {11,32,8,17,5,121248,1,2,23,111340,3,14,26,20,29};
for (int i = 0; i < locationList.Length; i++)
{
    string strServiceLocation = string.Format(@"{""ServiceCenterID"": {0}, ", locationList[i]) + "/n";
}

Error:

An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in user code

Additional information: Input string was not in a correct format.

Any help appreciated.