what is the pattern for 3,7,15,31,63,127

3,7,15,31,63,127 what is the pattern
in Geometry Answers by Level 1 User (120 points)

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2 Answers

Starts with four ($) then doubling 4, the 8 betweenthe numbers then 16, 32 etc
by Level 6 User (23.6k points)
Double and then add one
by Level 9 User (42.6k points)

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