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A lucky number, in number theory, is a natural number generated by a particular sieve algorithm.

Lucky number may also refer to:

Film and television

• The Lucky Number, a 1933 British comedy film
• Lucky Number (film), a 1951 Donald Duck cartoon
• Lucky Numbers, a 2000 American comedy film
• #Lucky Number, a 2015 film starring Tom Pelphrey
• Lucky Numbers (TV series), a 1995–1997 British game show

Music

• Lucky Number (album) or the title song, by Jolin Tsai, 2001
• Lucky Numbers (album), by Frank Sinatra, 1998
• Lucky Number: The Best of Lene Lovich, an album by Lene Lovich, 2004
• "Lucky Number" (song), by Lene Lovich, 1979
• "Lucky Number", a song by Saves the Day from Saves the Day, 2013

Other uses

• Lucky numbers of Euler, producing prime-generating polynomials
• A number believed to affect one's luck
• Lucky number combinations, an element of Chinese numerology
• Lucky Numbers, a discontinued Cadbury product