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Here is a sequence of numbers. The goal is simply to provide the next 10 digit number in the series.

    6311433600
    3155760000 
    2840140800 
    2808604800 
    2805926400 
    2805321600 
    2805235200
    ??????????

Hint:

Time is of the essence

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5
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2805231600

My process:

My first thought was to figure out the difference between each successive number, assuming that this was a sequence. When I saw that the difference of the last two was 86400, which I know to be the number of seconds in a day, I did a little googling and found that the other differences corresponded to successively larger units of time- a week, a 31-day month, etc. So the next number should be smaller by an hour, or 3600 seconds.

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  • $\begingroup$ The differences are, in order: 100 years, 10 years, 1 year, 1 month, 1 week, 1 day. $\endgroup$ – Joe Z. Aug 7 '15 at 2:58

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