The average order of the Dirichlet series of the gcd-sum function.
Characterizing the sum of two cubes.
The gcd-sum function.
Asymptotic order of the square-free part of .
Divisibility by 3 of even multiperfect numbers of abundancy 3 and 4.
On the subsequence of primes having prime subscripts.
Some divisibility properties of binomial coefficients and the converse of Wolstenholme's theorem.
Restricted divisor sums
On the number of solutions of exponential congruences
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