"The numbers represent the ingredients of some sort of evil weapon being constructed by DHARMA:
4= Beryllium (Be) -- Powdered beryllium is extremely toxic!
8= Oxygen (O) -- If carbon is the foundation of life, oxygen is the fuel
15= Phosphorus (P) -- Phosphorus is all about fire
16= Sulfur (S) -- Sulfur is the element of war and is one of three ingredients in gunpowder
23= Vanadium (V) -- Vanadium as an impurity gives the green color to many pretty gemstones (Green flash)
42= Molybdenum (Mo) -- The melting point of molybdenum is a good 1000C higher than steel and used as laser applications."
So THAT'S why they cursed Hurley like that!