Let D be a (v, k, λ)-difference set in an abelian group G, and (v, 31) = 1. If n = 5p r with p a prime not dividing v and r a positive integer, then p is a multiplier of D. In the case 31|v, we get restrictions on the parameters of such difference sets D for which p may not be a multiplier.
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机译：设D为阿贝尔群G中的（v，k，λ）差集，（v，31）=1。如果n = 5p r 且pa素数不除v和ra为正整数，则p是D的乘数。在情况31 | v中，我们限制了此类差异集D的参数，而p可能不是乘数。
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