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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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