Declension table of ?idamprathama

Neuter	Singular	Dual	Plural
Nominative	idamprathamam	idamprathame	idamprathamāni
Vocative	idamprathama	idamprathame	idamprathamāni
Accusative	idamprathamam	idamprathame	idamprathamāni
Instrumental	idamprathamena	idamprathamābhyām	idamprathamaiḥ
Dative	idamprathamāya	idamprathamābhyām	idamprathamebhyaḥ
Ablative	idamprathamāt	idamprathamābhyām	idamprathamebhyaḥ
Genitive	idamprathamasya	idamprathamayoḥ	idamprathamānām
Locative	idamprathame	idamprathamayoḥ	idamprathameṣu

Compound idamprathama -

Adverb -idamprathamam -idamprathamāt