It has been conjectured by Paolo P. Lava (2009) that Giuga numbers are the solutions of the differential equation n' = n+1, where n' is the arithmetic derivative of n.
Paolo P. Lava (2009) sejtése szerint a Giuga-számok az n' = n+1 differenciálegyenlet megoldásai, ahol n' megegyezik n aritmetikai deriváltjával.