Plot summary
Hurley wins the lottery using numbers he heard in the Santa Rosa psych ward, but he and his loved ones start to suffer from bad luck. He goes to the ward to talk to the ex-Navy numbers man, who explains that he heard them while serving with a man in Australia. Hurley meets the man's wife, who explains that he committed suicide and picked up a transmission repeating the numbers during service. In the present, Hurley notices the numbers on Rousseau's documents and sets out to find her. She explains that she and her team were drawn to the island by the transmission, and after they died, she changed the transmission to her distress call.
Charlie asks him why he has been so stressed and opens up about his addiction to try and get him to reciprocate. When Hurley admits he is rich, Charlie storms off, believing it to be a joke, and the numbers are shown engraved in the side of the hatch.
Credits
Adapted from Wikipedia contributors, Lost season 1. HTML formatting and reference markers removed.