68

This number is a composite.

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68 = -53+19+43+59. If -53 is considered to be a prime, then the sum of any three of these 4 primes is the square of a prime number; specifically the squares of the first 4 odd primes. [Rupinski]

Submitted: 2002-10-31 00:07:03; Last Modified: 2008-01-30 17:28:00.