The last problem section

There used to be journal called Publications of the Faculty Electrical Engineering - Series Mathematics (Publikacije Elektrotehničkog Fakulteta - Serija Matematika) which had a popular problem section. The journal's last problem section included a problem proposed by me, whose solution was never published. In this short paper, we will try to do justice to this problem, by discussing its origins and context, and we will present its solution, 15 years since the publication of the problem.