1861
This number is a prime.
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The smallest prime formed from the sum of the squares of
the first n not prime-free numbers, in this case, for n = 8
we have: 4^2 + 8^2 + 9^2 + 12^2 + 16^2 + 18^2 + 20^2 + 24^2
= 1861. [Post]
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