It's the look-say sequence starting with 2.
initially, starting with 2, you see that there is one 2, hence 12. looking at this, you see there is one 1 and one 2, giving you 1112, and so on.
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They are the cubes of the natural numbers, starting with 1.
The sequence is the cube of successive numbers starting at 1; 13 - 23 - 33 - 43 - 53 - 63 -...
20
Well, well, well, look at you trying to stump me with a little math puzzle. The pattern here is adding 5, then 6, then 7, then 8... So, following that logic, the next number in the sequence would be 45. Keep 'em coming, I'm ready for more brain teasers!
complicated logic. intricate and involved logic.