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The last Independence Day was the 68th Independence Day. Now, the number 68 has a lot of unique properties. It is a Perrin number. It is the largest known number to be the sum of two primes in exactly two different ways: 68 = (7 + 61) and 68 = (31 + 37). Because of the factorization of 68 as 22. (42 + 1), a 68-sided regular polygon may be constructed with compass and straightedge. There are exactl

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