Two Hadamard matrices of order 956 of Goethals-Seidel type


No Hadamard matrices of order 956 appear in the literature. In this note we construct two such matrices. They are both of Goethals-Seidel type. As a consequence of this and of a result of Seberry and Yamada, we conclude that there exist 4-Williamson type matrices of order 1913.

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This work was supported by NSERC of Canada Grants A-5285 and EQP0107539.

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Đoković, D.Ž. Two Hadamard matrices of order 956 of Goethals-Seidel type. Combinatorica 14, 375–377 (1994).

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AMS subject classification code (1991)

  • 05 B 20
  • 05 B 30