A number theory problem by Rahul Chowdhury

Let t n t_n denote the number of integer sided triangles with distinct sides chosen from { 1 , 2 , 3 , 4 , , n } \{1,2,3,4, \ldots, n\} . Then t 20 t 19 = t_{20} - t_{19} =

200 39 81 165

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