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Verified answer
1 , 9 , 29 , 67 , 129 , ....U1 = 1 = 1³
U2 = 9 = 2³ + 1
U3 = 29 = 3³ + 2
U4 = 67 = 4³ + 3
.. .
Rumus suku ke n :
Un = n³ + (n - 1)
U6 = 6³ + 5 = 221
U7 = 7³ + 6 = 349
U8 = 8³ + 7 = 519
U9 = 9³ + 8 = 737