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Prime One Less Than Square
Problem
It can be seen that $2^2 - 1 = 3$ is prime.
Find the next example of a prime which is one less than a perfect square.
Problem ID: 281 (15 Jul 2006) Difficulty: 2 Star
It can be seen that $2^2 - 1 = 3$ is prime.
Find the next example of a prime which is one less than a perfect square.
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