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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 ... and in binary 73 is a palindrome, 1001001, which backwards is 1001001.
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Classic pin-back button covered with scratch and UV-resistant mylar. Printed in the U.S.A.
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