The son of Rājaka will be Nandivardhana, and thus in the Pradyotana dynasty there will be five kings, who will enjoy the earth for 138 years.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रद्योतसंज्ञं राजानं कर्ता यत्पालकः सुतः । विशाखयूपस्तत्पुत्रो भविता राजकस्ततः
pradyotasaṃjñaṃ rājānaṃ kartā yatpālakaḥ sutaḥ | viśākhayūpastatputro bhavitā rājakastataḥ
SB 12.1.3