On the number of solutions of congruences and equations in
On the number of solutions of decomposable polynomial equations
On the number of solutions of exponential congruences
On the number of solutions of f(n) = a for additive functions
On the number of solutions of linear equations in units of an algebraic number field.
On the number of solutions of N - p = Pr.
On the Number of Solutions of p + h = Pr.
On the number of solutions of simultaneous Pell equations
On the number of solutions of simultaneous Pell equations II
On the number of solutions of the generalized Ramanujan-Nagell equation
On the number of square classes of a field of finite level.
On the number of subgroups of finite abelian groups
Letwhere denotes the number of subgroups of all abelian groups whose order does not exceed and whose rank does not exceed , and is the error term. It is proved that
On the number of subgroups of given index in the modular group.
On the number of subsets of relatively prime to and asymptotic estimates.
On the number of subsets relatively prime to an integer.
On the number of sums and products
On the number of terms of a composite polynomial
On the number of terms of a power of a polynomial
On the number of values taken by a polynomial over a finite field
On the number of ways of writing as a product of factorials.