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The numbers k! L 1 for k = 2(1)100, and 2*3-5 * p + 1 forp prime, 2 6 p ? 307, were tested for primality. For k = 2(1)30, factorizations of k! -+ 1 are given. In this note, we present the results of an investigation of k! th 1 and 2*3*5 * .. p -i 1. An IBM 1130 computer was used for all computations. A number N of one of these forms was first checked for primality by computing
Alan Borning (Sat,) studied this question.