My only guess after skimming at it would be 39...that would fit in the pattern so far...but I don't know if it's right. Every other number subtracts 17, while the other opposite set would add 1 each time....but that's probably wrong.
well just giving you 4 terms doesn't tell you anything about the general form. 39 is as good an answer as any. Obviously you can make the rest of the terms whatever you want. What sort of quiz was this? Silly questions
As for whether it's part of a well-known sequence of interest, the online integer sequence encyclopedia gives no results.
I agree, it doesn't seem like there is enough information. You could always fit a polynomial to the points (1,73),( 2,61), etc, and extend the series that way (which is essentially what you're doing when you look at the difference between the difference between ... between the difference of consecutive terms (see the method of differences used in Babbages' http://en.wikipedia.org/wiki/Difference_engine" [Broken]) ). What is the context of the problem? Give some more examples from this problem set. Should we look at mathematical properties like the prime factorizations or sums of digits, or could it be something like the number of days in certain months of the year?
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