From Muppet Wiki

4 is a number in the Arabic Numeral System—the most widely used numeral system in the world. The number 4 first sponsored Sesame Street in its second week, beginning with episode 0006. The number 4 has since sponsored many episodes of Sesame Street and was featured prominently in episode 0734.

Songs about 4

• "Four" (Little Jerry and the Monotones)
• "Four Furry Friends" (Herry Monster, Oscar the Grouch, Cookie Monster and Grover)
• "I Just Adore Four" (Big Bird and the Tarnish Brothers)
• "Four Fun" (Big Bird)
• "Four Song (Song of Four)"
• "Jazz #4"
• "Pinball Number Count"
• Donnie Budd -- "Four Lions at my Door"
• Number Guy -- "How Many Elephants Can You Fit in a Room?"
• "1234"

Skits about 4

• The Mad Painter #4
• Number of the Day
• Sesame Street Floating Face Sketches

From Lostpedia

Image from the Jigsaw Puzzles

4 is the first of the Numbers. Below is a list of appearances on the show, by episode chronology.

4 is a very common number, and many of the occurrences could be coincidental. See article: apophenia.

Occurrences in the show

Season 1

• Jack tells the pilot that at least 48 people survived the plane crash.
• The doubling cube shows number 4 while Locke explains backgammon to Walt. (This changes to a 16 in the same scene.) ("Pilot, Part 2")
• Locke had lived with his paralysis for 4 years. ("Walkabout")
• Boone's T-shirt had the number 84 on it (in the form of a Japanese kanji symbol). ("Solitary")

Leonard Simms playing Connect Four.

• Sayid says the beach will be eroded in 4 days.
• Hurley says Charlie shot Ethan 4 times. ("Homecoming")
• Number 4 appears on a jersey of a rugby player shown on the television in the bar where Sawyer met Christian Shephard. ("Outlaws")
• Leonard Simms was playing the game Connect Four. ("Numbers")
• Martha Toomey told Hurley that Sam Toomey had been dead for 4 years. ("Numbers")
• Sarah's PJs have the number 44 printed onto the left shoulder and back ("Do No Harm")

Season 2

The Swan countdown timer at four minutes.

• Kate counts to 4 before she notices light shifting as she's being lowered in to the hatch. ("Man of Science, Man of Faith")
• The alarm sounds 4 minutes before the countdown timer expires, where the numbers must be entered. ("Adrift")
• Libby tells Ana Lucia that Donald will be the "fourth one to go" if they don't help with his injury. ("The Other 48 Days")
• The Blast Door map in the same episode features the expression "√16. √64. √225" beneath The Flame which evaluates to 4, 8, and 15. ("Lockdown")
• The September 22nd System Crash occurred at 4:16. ("?")

Season 3

• The number of the locker that housed Kate's dress is 841. ("A Tale of Two Cities")
• Eddie Colburn's Humboldt County Sheriff's Department ID number is 84023. ("Further Instructions")
• Sawyer's prisoner ID number is 840. ("Every Man for Himself")
• Munson's prisoner ID is 248 in a prison Sawyer is also in. ("Every Man for Himself")
• Eko found his youth photo in the 4th chapter of Isaiah. ("The Cost of Living")
• 4:8:15 is carved into Eko's stick. ("The Cost of Living")

Season four of the TV show Exposé

• 4 chimes are heard while Desmond is inspecting the ring. ("Flashes Before Your Eyes")
• Nikki had a role in the 4th Season of Exposé. ("Exposé")
• Juliet said it was the 4th time her shoulder was dislocated. ("Left Behind")
• Ben released toxic gas in the van at 4 in the afternoon, killing his father. The rest of the Purge ostensibly occurred at the same time. ("The Man Behind the Curtain")
• Charlie claims he holds his breath for 4 minutes. ("Greatest Hits")
• Charlie was the 4th person to pass Nadia on the streets. ("Greatest Hits")
• After killing Tom at the beach, Sawyer's body count was increased to 4. The other three being Frank Duckett, an unnamed other, and Anthony Cooper.
• Desmond saves Charlie's life 4 times before Charlie's death in Through the Looking Glass.

Season 4

• Penelope Widmore's home address is 423 Cheyne Walk. ("The Constant")
• Ben says he is going to see "Mr. and Mrs. Kendrick in 4E". ("The Shape of Things to Come")
• Jack resuscitates Desmond after compressing his chest 4 times, attempting to revive him after the helicopter crash. ("There's No Place Like Home, Parts 2 & 3")
• There are 4 Dogs (we can see) in cages as Sayid walks to meet Ben in the veterinarian's office. ("The Economist")
• The phone number Penny gives Desmond is 7946 0893 ("The Constant")

The Lost Experience

• Zander is missing for 4 months before Cliff begins to search for him. (Bad Twin)
• Cliff began his search for Zander on April 15th (4/15) (Bad Twin)

Season 5

• When riding the elevator to meet Sun, Kate tells Aaron to push the button "Three One". (3+1=4). ("Because You Left")
• The swinging pendulum in Ms. Hawking's lab passes the camera 4 times, then another 4 times (making 8). If we continue counting from there, we get a total of 16 passes (and consequently, 15 before it). ("The Lie")
• Many survivors were killed in the fourth time shift. ("The Lie")
• Miles senses the graves of 4 dead U.S. soldiers. ("Jughead")
• Juliet fired 4 shots at the people in the outrigger. ("The Little Prince")
• When Montand was pulled under the temple by the smoke monster, 4 people tried to pull him out ("This Place Is Death")
• On the beach, Rousseau fired the gun 4 times - once at Robert, three times at Jin. ("This Place Is Death")
• 4 people went to see Eloise Hawking - Ben, Jack, Sun, and Desmond. ("This Place Is Death")
• The donkey wheel blinked 4 times before John Locke turned it the final time. ("This Place Is Death")
• Desmond tells Ms. Hawking that going to the Island has cost him 4 years of his life. ("316")
• Jack's Grandfather, Ray has made 4 failed attempts to escape from his retirement home. ("316")
• Jack sees a photo of the Island dated September 23,1954. ("316")
• The death date on the headstone John Locke visited was April (Which is month number 4) 8, 2006. ("The Life and Death of Jeremy Bentham")
• Widmore asks John Locke how long it's been since he walked into the Others' camp, Locke replies 4 days. ("The Life and Death of Jeremy Bentham")
• LaFleur beeps the horn 4 times for Miles to come outside. ("LaFleur")
• Young Miles found the dead body in apartment 4. ("Some Like It Hoth")
• Sawyer directed Miles to the security monitors and saw Sawyer and Kate on monitor 4. ("Some Like It Hoth")
• Horace told Miles to deliver a package to Radzinsky at grid 334. ("Some Like It Hoth")
• There are 4 bars on the middle window of the Dharma van

Season 6

• Kate and Edward Mars go through security at LAX at a booth labeled 4F. (6x2)

Outside the show and real life occurrences

• The central tenets of Buddhism are called the Four Noble Truths.
• The object in the Connect Four game is to get four of your checkers in a row, either in a vertical, horizontal, or diagonal way.
• 4 is a bad luck number in Chinese, Korean, and Japanese culture. It is associated as the death number.
• Humans experience the world in 4 dimensions: length, width, height, and time.
• 4 gospels.
• 4 seasons.
• 4 elements (earth, water, air and fire)
• 4 horsemen of the apocalypse (war, famine, plague and death)
• At the Passover seder every year, Jewish people ask 4 questions, drink 4 cups of wine, and discuss the story of the 4 sons.
• From TV Tropes, a list of the number 4 uses in TV, Books and many other.[1]