'Lost' Number Combos

4 8 15 16 23 42

• The numbers showed up on the odometer of the Camaro Hurley's dad gave him for his birthday after he got off the island. Hurley ran away screaming. (Ep: 4x12, There's No Place Like Home Part 1)

• The psychic claims that she sees these numbers surrounding Hurley, but Hurley figures out that his father had put her up to saying that. (Ep: 3x10, Tricia Tanaka is Dead)

• The numbers appear on the medicine vials that Claire remembers in her abduction recollections. ( Ep: 2x15, Maternity Leave)

• Inman shows Sayid DIA video footage labeled “Reel 23108-42”. ( Ep: 2x14, One of Them)

• The numbers appear on the bottle of the meds that Desmond takes. ( Ep: 2x1, Man of Science, Man of Faith)

• When Hurley runs through the airport, he passes a girls soccer team. They are standing in order with the numbers on their jerseys. ( Ep: 1x24, Exodus Part 2)

• The setting on Hurley's car read: 42 KM 23 degrees and 16 KPH (speed), 15, then KPH 8, then 4. ( Ep: 1x24, Exodus Part 2)

• Hurley's winning lottery ticket numbers. ( Ep: 1x18, Numbers)

48

• Ben tells Juliet that they activated the implant and Claire would become symptomatic within 48 hours. (Ep: 3x16, One of Us)

• There are 48 seconds left on the timer when Desmond wakes and Kelvin is below the hatch, drunk, with the security system key. (Ep: 2x23, Live Together, Die Alone)

• The Tailies met the fuselage group on the 48th day. ( Ep: 2x7, The Other 48 Days)

• Forty-eight passengers survived in the fuselage section of the plane.

108

• The Oceanic representative claims that the Oceanic Six used a raft to travel off the island on day 108. (Ep: 4x12, There's No Place Like Home Part 1)

• The monk tells Desmond that they've only bottled 108 cases of wine. (Ep: 3x17, Catch 22)

• Sawyer jokes that they need to play ping pong every 108 minutes or the island will explode. (Ep: 3x17, Catch 22)

• On the digital clock that Desmond sees that reminds him of the hatch timer. (Ep: 3x8, Flashes Before Your Eyes)

• On the diagram, several areas are marked CVI, CVII, CVIII. Those are the Roman numerals for 106, 107, and 108. (Ep: 2x17, Lockdown)

• The timer in the hatch starts at 108 minutes and has to be reset between the time it reaches 4 and 0 minutes. ( Ep: 2x2, Adrift)

• 108 appears when Jack is in the corridor of the hatch. It's on the mural in the background. ( Ep: 2x1, Man of Science, Man of Faith)

• If you add all the numbers together 4+8+15+16+23+42, you get 108.

815

• At 8:15 Pierre Chang gets up and feeds the baby. (Ep: 5x1, Because You Left)

• Sayid asks the man outside the mental institute the time and the man is about to say 8:15 before he is shot. (Ep: 4x13, There's No Place Like Home Part 2)

• A delivery man brings a package for number 815. (Ep: 3x8, Flashes Before Your Eyes)

• The real Henry Gale's address is 815 Walnut Ridge Road. (Ep: 2x17, Lockdown)

• Ana-Lucia identifies her squad car as 8A15. ( Ep: 2x8, Collision)

• The time of death for Adam Rutherford was 8:15 a.m. (Ep: 2x1, Man of Science, Man of Faith)

• The cassette tape that Kate and Tom find in the capsule is dated 8/15/89. ( Ep: 1x22, Born to Run)

• The model number on the copier that Charlie attempts to demonstrate is C815. ( Ep: 1x15, Homecoming)

• Kate gets the toy plane from safe deposit box number 815. ( Ep: 1x12, Whatever the Case May Be)

• The Oceanic plane that crashed had a flight number of 815.

Other

• In 1996, Penny lives at 423 Cheyne Walk. (Ep: 4x5, The Constant)

• The lot number for the Black Rock journal auction is 2342. (Ep: 4x5, The Constant)

• Daniel tells Desmond to tell the 1996 Daniel to set the device to 2.342. (Ep: 4x5, The Constant)

• 842 was the number on the helicopter that landed on the island. (Ep: 4x2, Confirmed Dead)

• 84023 is the zip code listed on Eddie's I.D. (Ep: 3x3, Further Instructions)

• 0415 is the number of the subject written about in the journal that Kate reads from. (Ep: 2x23, Live Together, Die Alone)

• 1516 is the number on the door of Jae's hotel room or apartment where Jin attacks him. (Ep: 3x2, The Glass Ballerina)

• 1516 is the number of the safety deposit box where Locke retrieves his father's money. (Ep: 2x17, Lockdown)

• The Apollo candy bar expires on the 23rd of an unknown month in 2004.

• The letter to Penny Widmore had several of the numbers in the to and return addresses.

ADDITIONAL SOURCES:
TV Dramas About.com
Teen TV/Movies About.com
4815162342.com
The Lost Numbers
Lost Hatch
Finding Lost: The Unofficial Guide.