MathSciNet bibliographic data MR396390 (53 #257) 10A25 Williams, H. C.; Judd, J. S. Determination of the primality of $N$$N$ by using factors of $N\sp{2}\pm 1$$N\sp{2}\pm 1$. Math. Comp. 30 (1976), no. 133, 157–172. Article

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