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From the January 2016 issue, MDPI journals will use article numbers in place of the traditional method of continuous pagination through the volume. This step helps us to maintain a rapid, efficient production process by being able to define pagination as soon as a paper is accepted. We have recently made a number of improvements to article layout and production procedures, of which article numbers is just one component. You can read more about the changes at http://blog.mdpi.com/2015/12/01/a-new-look-for-mdpi-papers/.
For papers that use article numbers the page number will start from 1 and the citation needs only list the article number, e.g., Holmes, L.; LaHurd, A.; Wasson, E.; McClarin, L.; Dabney, K. Racial and Ethnic Heterogeneity in the Association Between Total Cholesterol and Pediatric Obesity. Int. J. Environ. Res. Public Health2016, 13, 19 (article number: 19. https://www.mdpi.com/1660-4601/13/1/19).