ἀριθμητής
From LSJ
Ὁ δὲ μὴ δυνάμενος κοινωνεῖν ἢ μηδὲν δεόμενος δι' αὐτάρκειαν οὐθὲν μέρος πόλεως, ὥστε ἢ θηρίον ἢ θεός → Whoever is incapable of associating, or has no need to because of self-sufficiency, is no part of a state; so he is either a beast or a god
English (LSJ)
οῦ, ὁ,
A calculator, Pl.Just.373b.
German (Pape)
[Seite 351] ὁ, der Rechner, Plat. de iust. 373 d.