Restricted divisor sums
On the number of solutions of exponential congruences
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.
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