ket fn: prime-factors

prime-factors:
    description:
        prime-factors ket
        returns a list/superposition of prime factors

    examples:
        prime-factors |987654321>
            2|3> + 2|17> + |379721>

        prime-factors |number: 123456789>
            2|number: 3> + |number: 3607> + |number: 3803>

    see also:
        is-prime