The answer above is correct... If you subtract 1 from each number in the sequence 2-1=1 9-1=8 28-1=27 65-1=64 126-1=125 Note: Each number on the right hand side is a perfect cube 1 =1^3 8=2^3 27=3^3 64=4^3 125=5^3 From this we can conclude the formula is n^3+1 6^3 =216 +1 = 217 The next number in the sequence is 217