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gcdlcm 

        # Integer.gcdlcm

(from ruby core)
---
    int.gcdlcm(other_int)  ->  array

---

Returns an array with the greatest common divisor and the least common
multiple of the two integers, [gcd, lcm].

    36.gcdlcm(60)                  #=> [12, 180]
    2.gcdlcm(2)                    #=> [2, 2]
    3.gcdlcm(-7)                   #=> [1, 21]
    ((1<<31)-1).gcdlcm((1<<61)-1)  #=> [1, 4951760154835678088235319297]

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