A little help creating a 5x3 table

Hi guys I'm a bit lost on where to go with my table. I need a 5x3 table to take in 15 random digits. I'm not sure if what I have is even in the right direction of what I need.

for(int i = 1; i < 16, i ++){
for(int j = 1; j < 16; j++)
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