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Special 24
Age 7 to 11
Challenge Level 
The number $24$ is special because it is just one short of being a square number.
So $24 + 1 = 25$ and $5^2 = 25$
AND when you double $24$ the answer is also one short of being a square
number.
So $24 \times 2 = 48$ and $48 + 1 = 49$ and $7^2 = 49$.
Find another number that is special in the same way as $24$.
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