Daily Archives: January 20, 2022

day/dydd 20 at 7puzzleblog.com

Posted on January 20, 2022 by 7puzzle

The Main Challenge Consider all whole numbers from 1 to 60, then delete the following:  all prime numbers,  … and any number that differs by 1 from a prime,  all square numbers,  … and any number that differs by 1 from a square, … Continue reading →

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