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@cheesewhisk3rs proof: Pomerance said that he first discovered the Math Horizons article back in 2015 and sent a brief email to Spicer. However, he did not follow-up with Spicer until last summer, when he contacted Spicer about working together to create a proof. Spicer said that after about 130 emails exchanged between the two mathematicians, they had figured out the proof.

Before Pomerance and Spicer wrote the proof, it was possible to use a computer to search and not find other examples of numbers with similar unique qualities to the number 73. However, Spicer said that their proof rules out numbers even beyond the range of computers, and shows that the number 73 is finitely unique.
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