number challenge

Complete the number sequence. Do you know the last number? Did you spot the sequence? Please like if you answered correctly:)

created by zbynny

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no hint for this puzzle

Multiply each digit by 2.

1 4 6 9
2 8 12 18 -> (281218)
4 16 2 4 2 16 -> (41624216)

8212484212 = the correct answer

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