A positive integer m is said to be practical if every n with 1 n m is a sum of distinct divisors of m.
Some article about practical numbers can be found on line in my papers. P. Erdos, W. Sierpinski, G. Tenenbaum, E. Saias B.M. Stewart, H.N. Shapiro, M. Margenstern, M. Hausman, and others dealt with practical numbers in their papers.
Table of practical numbers
Table of twin practical numbers
Table of triplets of practical numbers
Table of 5-uples of practical numbers
Giuseppe Melfi's home page
Group of Statistics of the University of Neuchâtel