105
1st number is 13 = 1
2nd number is 23 = 8
3rd number is 33 = 27
So, 4th number is 43 = 256
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27
the numbers next in series are 35,43,51,... any two consecutive terms has a difference of 8
-243
37
The next cube number, after 43 = 64 is 53 = 125.