Is it said in the prostration of recitation: "Glory be to my Lord, the Most High" three times, or is the well-known supplication in prostration sufficient?

It is sunnah (recommended) to say during the prostration of recitation (sujud al-tilawah): "My face has prostrated to the One who created it, and fashioned its hearing and sight by His power and might." One may add: "So blessed be Allah, the best of creators." It is also permissible to say: "Glorified be my Lord, the Most High," or what is typically said in the prostration of regular prayer. Imam An-Nawawi recommended combining the supplication "My face has prostrated..." with the supplication: "O Allah, record for me with You a reward for it..." Some scholars differentiate between someone who is performing prayer, for whom it is recommended to combine tasbeeh (glorification) with du'a (supplication), and someone who is outside of prayer, for whom it is recommended to limit oneself to du'a.