The Loop (TV)
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Subsequently he often wears a t-shirt with the number 73 on it.
- Sheldon: "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."'"
- Leonard: "We get it, 73 is the Chuck Norris of numbers!"
- Sheldon: "Chuck Norris wishes. In binary 73 is a palindrome, 1001001, which backwards is 1001001. All Chuck Norris backwards gets you is Sirron Kcuhc!"'
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