Hi! Who knows! Sometimes manufacturers do that as a way to stand out from the crowd -- not always as a way to move numerically or in a linear fashion. For example, I thought I heard or read somewhere that Samsung chose to jump to the "20" line due to is being in the year 2020. It's pretty good for branding, marketing, and labeling. The products become more memorable to potential customers.
Marketing and competing with other brands are so huge! @RETG had a great point about Samsung wanting to be different from Apple.