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A Hadamard matrix of order 428. (English) Zbl 1076.05017
Summary: Four Turyn type sequences of lengths 36, 36, 36, 35 are found by a computer search. These sequences give new base sequences of lengths 71, 71, 36, 36 and are used to generate a number of new \(T\)-sequences. The first order of many new Hadamard matrices constructible using these new \(T\)-sequences is 428.

MSC:
05B20 Combinatorial aspects of matrices (incidence, Hadamard, etc.)
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