(1) 4,16,36,64, (), 144196... () (100th number); (2) 2,5,10,17,26..., () (50th number)

(1) 4,16,36,64, (), 144196... () (100th number); (2) 2,5,10,17,26..., () (50th number)

4,16,36,64, (), 144196... () (100th number)
It can be seen that its general formula is: n + 1 power of 2
So the 100th number is to the 101st power of 2
2,5,10,17,26...,( )
It can be seen that an = an-1 + n A1 = 0
That is, an-an-1 = n
So a2-a1 = 2
A3-A2=3
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An-An-1=n
So an-a1 = 2 + 3 + 4 +. + n
That is, an = (n-1) (n + 2) / 2
So the 50th number is: A50 = (50-1) (50 + 2) / 2 = 49 * 52
The final answer is calculated by yourself