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wornoutman

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Correct me if I am wrong, but I believe the author made an error. The author wrote:

"A prime from which you can remove numbers and still have a prime is a deletable prime, such as 1987".

However if you remove the 7, then the number is divisible by 2, so the statement: "A prime from which you can remove numbers and still have a prime is a deletable prime" does not apply to 1987.

To set my life straight. I dropped out of university, went to college because of my parents, I hate college. I want to drop out of college, finish my startup so I can get a developer job. My future depends on this startup.