"The best number is 73. Seventy three is the twenty-first prime number. Its mirror, 37, is the twelfth and its mirror, 21, is the product of multiplying (hang on to your hats) 7 and 3. In binary, 73 is a palindrome: 1-0-0-1-0-0-1, which backwards is 1-0-0-1-0-0-1."

-- Dr. Sheldon Cooper, The Big Bang Theory, Season 4, Episode 10 (The Alien Parasite Hypothesis)

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