4
Admittedly this isn't Homer, but it might still be useful. A TLG search (surprisingly) comes up with only two relevant sentences, both from Plato:
Theaetetus 204b-c has the numbers up to six in the neuter gender:
ἕν, δύο, τρία, τέτταρα, πέντε, ἕξ
One, two, three, four, five, six
Timaeus 17a counts up to three with the masculine gender:
εἷς, δύο, ...
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