181111181 is prime and idk that might be my new favorite number. Symmetric left-right and up-down and made of just 8 and 1 (and 8+1= 9 digits long!)
181111181 is prime and idk that might be my new favorite number. Symmetric left-right and up-down and made of just 8 and 1 (and 8+1= 9 digits long!)
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