Anonymous ID: f9572a March 23, 2021, 2 p.m. No.13283828 🗄️.is 🔗kun >>3836 >>13283807 Each difference is a triangular number. where for any u, T(u) = u(u+1)/2 T(3) = 6 T(4) = 10 T(5) = 15 … T(30) = 465