2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72965We establish a connection between the subfactorial function S(n) and the left factorial function of Kurepa K(n). Some elementary properties and congruences of both functions are described. Finally, we give a calculated distribution of primes below 10000 of K(n).7 pagesNumber Theory11B65text