The first is to say each of these phrases ten times, making thirty in total.
The second is to say each phrase eleven times, making thirty-three in total.
The third is to say each phrase thirty-three times, making ninety-nine in total.
The fourth is to conclude this with the full declaration of Allah’s oneness, making one hundred in total.
The sixth (1) is to say each of the four phrases twenty-five times, making one hundred in total.
As for reciting the Verse of the Throne, this has been reported through a chain of transmission that cannot establish a sunnah practice.
As for the imam and the congregation supplicating together after the prayer, no one has transmitted this from the Prophet, may Allah bless him and grant him peace. However, it has been transmitted that he instructed Muʿādh to say at the close of every prayer:
“O Allah, help me to remember You, thank You, and worship You well,”
and similar supplications. The expression dubur al-salāh (the close of the prayer) may refer to the final part of the prayer, just as the dubur (rear) of a thing means its back part. It may also refer to what comes after the prayer has ended, as in the words of Allah Most High:
“and after prostration.”
It may also encompass both meanings, and some hadiths