Narapatijayacarya 13.9

13.9

dhṛtiḥ pañcāgri-vahnīndū-bhāskaraṃ saptarūpakam ||
ṭādisaṃkhyā vijānīyāddagdhā jīvārkarāhubhiḥ ||

Eighteen, thirty-five, thirteen, twelve, and seventeen:
one should know the number belonging to the ṭa-class, scorched by Jupiter, the Sun, and Rāhu.