Question:
Are there infinitely many prime numbers in the Look-and-say sequence?
In the sequence, I found that $11$, $312211$ and $13112221$ are prime numbers.
2026-04-05 23:45:26.1775432726
Are there infinitely many prime numbers in the Look-and-say sequence?
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Not an answer.
I generated the first $50$ terms of the sequence; it does not take much time. The prime search is another story. Among the first $38$ (above, my computer gave up), as prime numbers, I only found the second and the two you reported.
Congratulations.