Little brother's homework. Can't figure it out and I'm feeling dumb. Reddit r/Homeworkhelp)

Need to complete the sequence 1, 11, 21, 1211, 111221, ?, ?. This is a very classic sequence called the “look and say sequence” also known as the Morris number sequence, that I had previously encountered and just saw this a few days ago on Reddit r/homeworkhelp. I didn't figure this out when I first got asked by my classmate a very long time ago.
Original post on Reddit: https://www.reddit.com/r/HomeworkHelp/s/egWOcwR8BR

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