Question:

What comes next in the sequence 1, 11, 21, 1211, 111221?

Answer:

Each number describes the previous one. 11 means "one 1", 1211 means "one 2, one 1". So, 312211 is next, "3 1's, 2 2's, 1 1".


Tags:
Mathematics
Integer sequences
Kolakoski sequence
Sequence learning
Entertainment Culture
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