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U1 = 1^2+2
U1 = 3
U2 = 2^2+2
U2 = 6
U3 = 3^2+2
U3 = 11
U4 = 4^2+2
U4 = 17
U5 = 5^2+2
U5 = 27
-> 3,6,11,18,27