Plato, Laws 738a

ἄνδρα νομοθετοῦντα νενοηκέναι, τίς ἀριθμὸς καὶ ποῖος πάσαις πόλεσιν χρησιμώτατος ἂν εἴη. λέγωμεν δὴ τὸν πλείστας καὶ ἐφεξῆς μάλιστα διανομὰς ἐν αὑτῷ κεκτημένον. ὁ μὲν δὴ πᾶς εἰς πάντα πάσας τομὰς εἴληχεν· ὁ δὲ τῶν τετταράκοντα καὶ πεντακισχιλίων εἴς τε πόλεμον καὶ ὅσα κατʼ εἰρήνην πρὸς ἅπαντα τὰ συμβόλαια καὶ κοινωνήματα, εἰσφορῶν τε πέρι καὶ διανομῶν, οὐ πλείους μιᾶς δεουσῶν ἑξήκοντα δύναιτʼ ἂν τέμνεσθαι τομῶν, συνεχεῖς δὲ ἀπὸ μιᾶς

what number and what kind of number will be most useful for all States. Let us choose that which contains the most numerous and most consecutive sub-divisions. Number as a whole comprises every division for all purposes; whereas the number 5,040, for purposes of war, and in peace for all purposes connected with contributions and distributions, will admit of division