Three is an example of a prime number. The only two numbers that you can multiply together to get three are one times three. One times three equals three, and there are no other factors.

Twin Prime Numbers: The prime numbers with only one composite number between them are called twin prime numbers or twin primes. For example, 3 and 5, 5 and 7, 11 and 13, 17 and 29, etc.

Teacher Notes. This can form an introduction to prime and composite numbers, and lead to discussion of ways to speed up identification of primes/composites, for example, using divisibility tests.

Using a notion called integer partitions, mathematicians have discovered a new way to detect prime numbers while also ...

'Mersenne primes' are those that take the form 2 n – 1. Not all numbers in this format are primes, of course. For example, 2 x 2 x 2 x 2 = 16, with 1 fewer equalling 15 (a composite of 3 and 5).

The highly composite number 60, for example, has become our standard for measuring time as it can be split into convenient equal portions of whole numbers—30 minutes (half an hour), 15 minutes ...

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 ...

A DECKING and cladding company has reported the sharpest growth in stockist numbers since it was founded. Composite Prime, based in The Grove, Ilkley, has reported the sharpest growth in stockists ...

Teacher Notes. This clip can form an introduction to prime and composite numbers, and lead to discussion of ways to speed up identification of primes/composites, for example, using divisibility tests.