Our Parsha Bamidbar deals with the numbers crunching of the census taken “on the first of the second month, in the second year after their exodus from… Mitzrayim” (Sefer Bamidbar, Perek 1, posuk 1):
“Take a census of the entire assembly of the B’nai Yisrael according to their families, according to their fathers’ household, by the number of the names, every male according to their head count. From twenty years of age and up — everyone who goes out to the legion in Israel — you shall count them according to their legions, you and Aaron.” (Sefer Bamidbar, Perek 1, posukim 2-4)