0
Anonymous
There are infinitely many possibilities:
25 (square of numbers: 3, 4, 5, ... )
23 (add 7 to previous number)
22 (add 7, then 6, then 5, ...)
24 (add 7, then 8, then 9, ...)
and so on.
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16
5
It is: 6 squared = 36
81