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Yes, 73 is the best number. The reason is because it's the 21st Prime number, and its mirror 37 is the 12th prime number, whose mirror 21 is the product of 7 times 3.

In binary 73 is 1001001, which is a palindrome

[cited from the Big Bang Theory]

Also, 21 is 42/2.

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11y ago

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