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Congruences for Wolstenholme primes

Romeo Meštrović (2015)

Czechoslovak Mathematical Journal

A prime p is said to be a Wolstenholme prime if it satisfies the congruence 2 p - 1 p - 1 1 ( mod p 4 ) . For such a prime p , we establish an expression for 2 p - 1 p - 1 ( mod p 8 ) given in terms of the sums R i : = k = 1 p - 1 1 / k i ( i = 1 , 2 , 3 , 4 , 5 , 6 ) . Further, the expression in this congruence is reduced in terms of the sums R i ( i = 1 , 3 , 4 , 5 ). Using this congruence, we prove that for any Wolstenholme prime p we have 2 p - 1 p - 1 1 - 2 p k = 1 p - 1 1 k - 2 p 2 k = 1 p - 1 1 k 2 ( mod p 7 ) . Moreover, using a recent result of the author, we prove that a prime p satisfying the above congruence must necessarily be a Wolstenholme prime. Furthermore, applying a technique...

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