6 13 29 63 | What is the next number in the sequence 6 13 29 63 ?

Find the next number that fits the pattern:

6, 13, 29, 63, ?

133

Explanation:

13 = 6 * 2 + 1
29 = 13 * 2 + 3
63 = 29 * 2 + 5
133 = 63 * 2 + 7

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