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The task is to find x. (Source https://free.ultimaiq.net/nse.htm)

123456, x , 93332736, 3359978496

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The answer is

$2592576$

The reason is:

To get from one number to the next, it is multiplied by the sum of its digits. So $123456$ is multiplied by $1+2+3+4+5+6=21$ to get $2592576$. This is multiplied by $2+5+9+2+5+7+6=36$ to get the next number $93332736$, and so on.

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