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The German submarine known as U457 was sunk in the Barents Sea by depth charges from the British destroyer HMS Impulsive during WWII. [Wynn]
The first Honaker prime (p_{88} = 457: 8+8 = 4+5+7) that is itself the subscript of another Honaker prime (p_{457} = 3229: 4+5+7 = 3+2+2+9). [Beedassy] The smallest prime number for which the reverse of its double is a smaller prime. [Gaydos] The 457th Fibonacci number is a 96digit number containing the digit 2 just once. Is this the largest Fibonacci number that has one or more unique digits? [Gaydos] The concatenation of the three values of n for which (n!+1) is a perfect square. [Kilpatrick]
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