If N is a prime number, then bN – b is always a multiple of N, no matter what b is. For instance, 7 is a prime number, and as a result, 2 7 – 2 (which equals 126) is a multiple of 7. Similarly, 3 7 – ...
Digitally delicate prime numbers become composite with this one weird trick. Math researchers proved these primes exist using the bucket proof method. There are no known examples so far, but ...
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