Několik kapitol z nauky o číslech
Neuere Untersuchungen über die Jacobsthal-Funktion g(n).
New Inversion Properties of ... and ...*.
Nonaliquots and Robbins numbers
Let φ(·) and σ(·) denote the Euler function and the sum of divisors function, respectively. We give a lower bound for the number of m ≤ x for which the equation m = σ(n) - n has no solution. We also show that the set of positive integers m not of the form (p-1)/2 - φ(p-1) for some prime number p has a positive lower asymptotic density.
Note on a congruence involving products of binomial coefficients.
Note on multiplicative functions satisfying congruence property. II.
Note on perfect and multiply perfect numbers
Note sur les diviseurs d'un nombre entier
Notes on generalized Dedekind sums
Notes on power LCM matrices
Nouveau théorème concernant la fonction numérique .