Imagine that Franklin D. Roosevelt, in one of his infamous Fireside Chats, shared an encrypted message whose decryption relied on the solution of the following problem. 

 

Solve the problem to get the correct radio channel to hear the important information that you will need to win this challenge.

 

What’s the smallest number that can’t be written by subtracting a prime from a square? For example, 1 = 4 – 3, 2 = 9 – 7, … 

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Select The Correct Radio Station