Numbers like 2, 3, 5, 7, and 11 are all prime numbers. What fewer people know is why these numbers are so important, and how the mathematical logic behind them has resulted in vital applications ...

But this made me wonder about how many American phone numbers are prime. I suppose I could just do a search through all the 10-digit primes, but it's more fun to think about it a bit more ...

Finally, find the common prime factors. To do this, find out which of the common factors are prime numbers. The common prime factors are 2 and 7, because they only have two factors - themselves and 1.

And associated to the number 55 (5 × 11) would be all multiples of 55 such that the smallest prime factor of the multiplier—the number that multiplies 55—is 11 (therefore excluding all ...

More secure connections often require greater factorization than the standard 256-bit, but in a GIMPS statement on the discovery, the team declares that the newest prime “is too large to ...

Because highly composite numbers have so many factors, they can be split into many combinations of equal groups, making them kind of the opposite of prime numbers, which only have two factors ...