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2, 5, 9, 14, 20, 27,......
+3 +4 +5 +6 +7,.......
2,5,9,14,20,27,35,44,54,65,77,90,104,119,135,152,170,189,209,230,252,275,299,324,350,377,405,434,464,495
U30=495