MathSciNet bibliographic data MR866123 (88b:11089) 11Y11 (11A51) Williams, H. C. Effective primality tests for some integers of the forms \$A5\sp n-1\$$A5\sp n-1$ and \$A7\sp n-1\$$A7\sp n-1$. Math. Comp. 48 (1987), no. 177, 385–403. Article

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