SOLUTION: what's next in this sequence? 1, 6, 12, 17, 34, 39, 78...

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Question 559368: what's next in this sequence? 1, 6, 12, 17, 34, 39, 78...
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Add 5, double it, add 5, double it, ...

Next number is 78+5 or 83.