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A comment on What is the largest bi-truncatable prime?. Parent comment

Re:What is the largest bi-truncatable prime? by jemfinch on Friday May 03, 2019 @10:05AM (#19818518)
I've written some simple code and verified that commenter's numbers through 19 digits.

Edit: parallelized the code and proved through 19 digits. That's where I'm stopping due to the uint64 space limitations.

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Re:What is the largest bi-truncatable prime? by dmurray on Friday May 03, 2019 @11:51AM (#19819481)
It looks exactly like a Project Euler question, I wouldn't be too surprised if it's already been solved there in the forums.
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