complete pattern 2 9 23 51

complete the pattern 2 9 23 51 and so on and also describe the pattern
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The difference between the numbers doubles as we move through the series: 7 14 28. So the next number would be 56+51=107. In general, the nth number would be 2+7(2^n-1). So when n=4, it would be 2+7*15=107.
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