Abstract
Given a strong starter for a groupG of ordern, where 3 does not dividen, a construction is given for a strong starter for the direct sum ofG and the integers modulo 5. In particular, this gives a Room square of side 5p for all non-Fermat primesp.
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Horton, J.D. Puintuplication of Room squares. Aeq. Math. 7, 243–245 (1971). https://doi.org/10.1007/BF01818519
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DOI: https://doi.org/10.1007/BF01818519