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4 15 59 235 939 3755 15019 etc

The numbers increase by multiplying by 4, then subtracting 1 from the answer.

This can be seen by visual comparison of the first three numbers. That the fourth number follows this sequence can be checked by using a calculator.
So what is the next number?
And, if you are really clever, what number comes before the 4?

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15y ago

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