operator: prime-factors

    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

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