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simeonvisser says
You are told that six times something is 858. So we can find that something by dividing 858 by 6 = 143. You can now generate the sequence of numbers to determine what n needs to be.

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to 858. Find n and list the numbers of this set.
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You are told that six times something is 858. So we can find that something by dividing 858 by 6 = 143. You can now generate the sequence of numbers to determine what n needs to be.