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U2= 2(2)²+1 = 9
U3= 2(3)²+1 = 19
U4= 2(4)²+1 = 33
U5= 2(5)²+1 = 51
U1= 2.1² + 1
= 3
U2= 2.2² +1
= 9
U3= 2.3² + 1
= 19
U4 = 2 . 4² + 1
= 33
U5= 2. 5² + 1
= 51