This is the classic Look-and-Say Sequence.
Let’s break it down:
Sequence given:
1 → “one 1” → 11
11 → “two 1s” → 21
21 → “one 2, one 1” → 1211
1211 → “one 1, one 2, two 1s” → 111221
111221 → “three 1s, two 2s, one 1” → 312211
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