Declension table of ?prathamāna

Neuter	Singular	Dual	Plural
Nominative	prathamānam	prathamāne	prathamānāni
Vocative	prathamāna	prathamāne	prathamānāni
Accusative	prathamānam	prathamāne	prathamānāni
Instrumental	prathamānena	prathamānābhyām	prathamānaiḥ
Dative	prathamānāya	prathamānābhyām	prathamānebhyaḥ
Ablative	prathamānāt	prathamānābhyām	prathamānebhyaḥ
Genitive	prathamānasya	prathamānayoḥ	prathamānānām
Locative	prathamāne	prathamānayoḥ	prathamāneṣu

Compound prathamāna -

Adverb -prathamānam -prathamānāt