cdn_PaleyIprimepower checks Hadamard Matrix can be constructed using Paley I method.
In Paley I method, If q=order-1 and q is prime power and q=3 (mod 4) then it retuns 14 otherwise NULL.
14 or NULL
Paley, R.E.A.C. (1933). On Orthogonal matrices. J. Combin. Theory, A 57(1), 86-108.
PaleyIPrimePower for Paley I construction method.
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