description: prime-factors ket returns a list of prime factors examples: -- without specifying a category: prime-factors |987654321> 2|3> + 2|17> + |379721> -- with specifying a category, in this example 'number: ' prime-factors |number: 123456789> 2|number: 3> + |number: 3607> + |number: 3803> to-comma-number prime-factors |987654321987654321> 2|3> + |7> + |11> + |13> + 2|17> + |19> + |52,579> + |379,721> see also: is-prime