Question 1034698
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1. 4 . given number 1
2. 1296 . given number 2
3. 16 . square of number 1 (number 3) 
4. 36 . square root of number 2 (number 4)
5. 256 . square of number 3 (number 5)
Next number : Square root of number 4 {{{sqrt(36)=6}}}
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The odd numbers increase by squares of last odd number, 
the even are square roots of last even number.
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