SB 9.22.35
taveme tanayas tata
janamejaya-purvakah
srutaseno bhimasena
ugrasenas ca viryavan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear King, your four sons — Janamejaya, Srutasena, Bhimasena and Ugrasena — are very powerful. Janamejaya is the eldest.