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Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.


Puzzle ID:#330
Fun:*** (2.1)
Difficulty:*** (2.3)
Submitted By:hydroman*
Corrected By:SaturnCat08




What are the next four numbers in this sequence?


notice interspersing sets - 1--2--3--4.. 5--6--(increase by one) and then 5--6--8--9--..12--13 (increase by one, then by two, then by one, then by three, then by one...)


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