The number of planets that are known to contain life

^{Set by 31415926535}

√4

^{Set by xyz_}

floor(π)

^{Set by AuroraIllumina}

ceiling(me)

^{Set by 31415926535 (or π)}

(2φ - 1)^{2}

^{Set by AuroraIllumina}

666/111

^{Set by xyz_}

Mickey Mantle's number

^{Set by davic6k}

H (_th letter of the alphabet)

^{Set by xyz_}

The highest number used in a standard Sudoku puzzle

^{Set by AuroraIllumina}

2 in its own base

^{Set by 31415926535}

Jesus and Judas déclined the invitation

^{Set by xyz_}

√(gross)

^{Set by 31415926535}

Number feared by a triskaidekaphobe

^{Set by AuroraIllumina}

Number loved by a tetrakaidekaphile

^{Set by xyz_}

10000 - 1 (binary)

^{Set by Evreka}

Sum from n = 0 to 4 of _{4}C_{n} ('4 choose n')

-OR-

2^{22}

^{Set by am18 and 31415926535}

The number of years in the average cicada's lifespan

^{Set by 31415926535}

Phone number to call firefighters in France

^{Set by xyz_}

Number of letters in the phase 'TWENTY-TWO MINUS THREE'

^{Set by AuroraIllumina (idea by Stegglosaur)}

Number of fingers in a couple

^{Set by xyz_}

Adele's second album

-OR-

The number of guns Green Day sings about

^{Set by braverobot and nateeverett}

How many catches that needed to be made before Joseph Heller wrote a book

^{Set by Project50Songs}

Latitude of tropics (rounded to nearest whole degree)

^{Set by xyz_}

Number of Prelude-Fugue sets in one book of Bach's Well-Tempered Clavier

^{Set by AuroraIllumina}

Number of miles from the north corner of Washington DC to home plate at Camden Yards minus Brooks Robinson's jersey number

^{Set by xant_spectro}

The number of bottles of beer on the wall after 73 agonising verses

^{Set by nateeverett}

Number of people who signed up for DA at first chance in *Harry Potter and the Order of the Phoenix*, minus 1

^{Set by Evreka}

Number of days in the shortest month of a normal year

^{Set by hockeystix3}

The number of palms a California city claims to have

^{Set by 31415926535}

Number of edges on an icosahedron (or on a dodecahedron)

^{Set by AuroraIllumina}

Number of département Haute-Garonne, in France

^{Set by xyz_}

Magic Johnson's jersey number

^{Set by braverobot}

Sum of first eight Fibonacci numbers (including the zero at the beginning)

^{Set by AuroraIllumina}

тридцать четыре

^{Set by xyz_}

The fifth tetrahedral number

^{Set by 31415926535}

Two rounds of golf (number of holes)

^{Set by am18}

Number of good things || Number of wonders

^{|| is the concatenation operator. For example, 12 || 34 = 1234.}

^{Set by Evreka}

Points for 'QUIZZICAL' in Scrabble (don't count bonuses, no blanks, assume there were actually two Z's)

^{Set by AuroraIllumina}

The number in the title of a popular children's adventure novel series written by many authors featuring Amy and Dan Cahill (The __ Clues)

^{Set by am18}

The total number of overs played in a game of T20 cricket

^{Set by nateeverett}

Niobium's atomic number

^{Set by Evreka}

The Answer to the Ultimate Question of Life, The Universe, and Everything

^{Set by braverobot}

The atomic number of the first element that does not exist in nature

^{Set by 31415926535}

2C (hexadecimal)

^{Set by am18}

XLV

^{Set by braverobot}

Mariah Carey's age (1970-2016)

^{Set by xyz_}

Council of Europe member states

^{Set by HappyWife}

The number of contiguous states in USA

^{Set by nateeverett}

7^{2}

^{Set by xyz_}

The number of songs that are featured in my quizzes!

^{Set by Project50Songs}

17*3

^{Set by Evreka}

Last two numbers in Tom Hanks' address and username in *You've Got Mail*

^{Set by HappyWife}

Opus number of Chopin's Heroic Polonaise in A-flat major

^{Set by AuroraIllumina}

Number of (1x1) squares of a Rubik's Cube

^{Set by braverobot}

The number of Electoral Votes that California has

^{Set by qlh27}

ϕ(87) (ϕ represents Euler's totient function)

^{Set by AuroraIllumina}

Number of ketchup varieties Heinz claims to have

^{Set by 31415926535}

A musical composition by John Cage, in which each musician was intended to be positioned in one of the arches of the Landhaus in Graz, Austria

^{Set by david6k}

February 28 (the __th day of the year)

^{Set by braverobot}

The smallest number you can divide by 1, 2, 3, 4, 5, 6

^{Set by xyz_}

Becomes 19 if written (or read) upside down

^{Set by Evreka}

5^{3} + 1^{3} + (-4)^{3}

^{Set by AuroraIllumina}

12 * 5 + 3

^{Set by Tdrez}

Number of (1x1) squares on a chessboard

^{Set by xyz_}

The retirement age in the U.S. established in the 1935 Social Security Act

^{Set by david6k}

Last two digits of the year author J.K. Rowling turned one year old

^{Set by Evreka}

My age + my brother's age + my sister's age

-OR-

34^{2} - 33^{2}

^{Set by braverobot}

The largest known number that can be expressed as the sum of two primes in exactly two distinct ways

^{Set by 31415926535}

The NSFW position

^{Set by Project50Songs}

'Sixty-ten' in French

^{Set by nateeverett}

The last two digits of 371^{479226}

^{Set by AuroraIllumina, they love their cryptography too much}

Par on a typical championship golf course

^{Set by david6k}

Sheldon Cooper's favorite number on *The Big Bang Theory*

^{Set by qlh27}

First half of song title with *The Connels*

^{Set by Evreka}

Second half of song title with *The Connels*

^{Set by Project50Songs}

With 'ers', a Philadelphia NBA team

^{Set by braverobot}

Number of US States + Number of letters in the alphabet + Number of things Meat Loaf won't do for love

^{Set by AuroraIllumina}

Platinum's atomic number

^{Set by Evreka}

Number of trombones in 'The Music Man'' + Number of times the U.K. has hosted the Summer Olympics

^{Set by bowsntoys}

Around the World in this many Days

^{Set by nateeverett}

(3²)²

^{Set by xyz_}

The number of games in the NBA/NHL regular season

^{Set by 31415926535}

African Union + Organization of American States - G6 (unofficial EU group)

^{Set by am18}

Pope John Paul II's age upon death

^{Set by braverobot}

The number of home games each MLB team plays each regular season + the number of playoff rounds an MLB Wild Card team must win to be World Champions

^{Set by michaeljgarman10}

Maxwell Smart

^{Set by caramba}

Devil's number in cricket

^{Set by Project50Songs}

Number of keys on a typical piano

^{Set by nateeverett}

4! + (4! + √4)/(.4)

^{Set by am18}

Feet between bases in a baseball field

^{Set by 31415926535}

The area of Anguilla in km^{2}

^{Set by xyz_}

The number of letters in the world's longest one-word place name, ^{Taumatawhakatangihangakoauauotamateaurehaeaturipukakapikimaungahoronukupokaiwhenuakitanatahu}

^{Set by hockeystix3}

Formed by simply taking the last two numerical characters in the 'Let's Count' thread's URL (if counting decimal digits only)

(The URL ends with 76d946ec9cc3)

^{Set by AuroraIllumina}

Number of days from July 29 until Halloween

^{Set by xyz_}

'Dogme __', the von Trier/Vinterberg filmmaking movement

-OR-

Number of theses propounded by Martin Luther in 1517, starting the Protestant Reformation

^{Set by braverobot and david6k}

Area of a triangle with side lengths 12, 16, 20

^{Set by AuroraIllumina}

The row number at which the Prophecy about Harry Potter and Lord Voldemort was located in the Hall of Prophecy. (in *Harry Potter and the Order of the Phoenix* )

^{Set by Evreka}

Degrees of boy band to whom you are everything

^{Set by HappyWife}

Red Balloons

^{Set by nateeverett}

Years of Solitude

^{Set by braverobot}

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