"73.
73 is the 21st prime number. it's mirror 37 is the 12th... and it's mirror 21 is the product of multiplying, (hang-on-to-your-hats) 7 and 3!!
in binary 73 is a palindrome 1001001. which backwards is 1001001, exactly the same!"
-Sheldon, BBT
think about it
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