Somavaṃśa-prasavaḥ
Birth of the Lunar Line: Budha–Purūravas and the Urvaśī Episode
तया सहावसद्राजा दश वर्षाणि चाष्ट च / सप्त षट्सप्त चाष्टौ च दश चाष्टौ च वीर्यवान्
tayā sahāvasadrājā daśa varṣāṇi cāṣṭa ca / sapta ṣaṭsapta cāṣṭau ca daśa cāṣṭau ca vīryavān
With her the valorous king dwelt for ten and eight years (eighteen); thereafter for seven, six, seven, eight, and again for ten and eight years as well (in due succession) he lived together with her.