On the product of divisors of and of .
Equations involving arithmetic functions of factorials.
Positive integers such that .
On the distribution of perfect totients.
Infinite sets of positive integers whose sums are free of powers.
On the equation .
Fermat numbers in the Pascal triangle.
Amicable Pell numbers.
On the Galois group of the generalized Fibonacci polynomial.
On Pillai's Diophantine equation.
Perfect powers with all equal digits but one.
Prime factors of with an irreducible polynomial .
.
Lucas Diophantine triples.
On multiplicative magic squares.
On the radical of a perfect number.
On positive integers with a certain nondivisibility property.
Counting Keith numbers.
.
On totient abundant numbers.
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