Question 395408
There are many ways to do this, but one way is to look for a repeating pattern. 



Often you'll have a pattern involving 2 arithmetic operations. In this case, we're dealing with multiplication and addition.



The jump from 1 to 4 is multiplying 1 by 4 to get 4.



To go from 4 to 9, we're adding 5



To get to 36 from 9, we're multiplying by 4 (starting to see the pattern?)



To go from 36 to 41, we're adding 5



So the next move is to multiply 41 by 4 to get 41*4 = 164



So the 6th number is 164.



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Jim