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We construct two difference families on each of the cyclic groups of order109, 145 and 247, and use them to construct skew-Hadamard matrices of orders436, 580 and 988. Such difference families and matrices are constructed herefor the first time. The matrices are constructed by using the Goethals-Seidelarray.

Skew-Hadamard matrices of orders 436, 580 and 988 exist