Un = n x n + 1
U5 = 5 x 5 + 1 = 26
U6 = 6 x 6 + 1 = 37
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pola: +3, +5, +7, +9, +11, ....
Un = n x n + 1
U5 = 5 x 5 + 1 = 26
U6 = 6 x 6 + 1 = 37