Declension table of ?idamprathama

Masculine	Singular	Dual	Plural
Nominative	idamprathamaḥ	idamprathamau	idamprathamāḥ
Vocative	idamprathama	idamprathamau	idamprathamāḥ
Accusative	idamprathamam	idamprathamau	idamprathamān
Instrumental	idamprathamena	idamprathamābhyām	idamprathamaiḥ idamprathamebhiḥ
Dative	idamprathamāya	idamprathamābhyām	idamprathamebhyaḥ
Ablative	idamprathamāt	idamprathamābhyām	idamprathamebhyaḥ
Genitive	idamprathamasya	idamprathamayoḥ	idamprathamānām
Locative	idamprathame	idamprathamayoḥ	idamprathameṣu

Compound idamprathama -

Adverb -idamprathamam -idamprathamāt