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The sum of the 12 signed primes in the set {2646613,
2311333, 1059181, 805213, 274019, 966227, 1075259,
1107467, 1119227, 1133219, 1146947, 1151963}. This set has
the remarkable property that the sum of any 11 elements is
the square of a prime. [Rupinski]
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