In Popular Culture
Dr. Sheldon Cooper in The Big Bang Theory, played by actor Jim Parsons, in Season 4 Episode 10 The Alien Parasite Hypothesis states "The best number is 73. Why? 73 is the 21st prime number. Its mirror (37) is the 12th and its mirror (21) is the product of multiplying 7 and 3. ... In binary, 73 is a palindrome, 1001001 which backwards is 1001001." This episode is the 73rd episode in the entire Big Bang Theory series.
Sheldon's roommate, Leonard Hofstadter, then quips that "73 is the Chuck Norris of numbers," to which Sheldon replies "Chuck Norris wishes. All Chuck Norris backwards gets you is Sirron Kcuhc!"
Sheldon's devotion to the number is illustrated in several further episodes, when he wears a t-shirt emblazoned with it, for example in The Roommate Transmogrification.
Read more about this topic: 73 (number)
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