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what is next number in pattern below

131 517 192 123 ?
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Not sure of any better way if any to define/describe the given sequence…

But a closer look at numbers ends-up this to be a spacing act on the given digits…

131 517 192 123 ?    ===> (Rewrite as TWO digit numbers) ===>  13  15  17  19  21  23  25  27           

i.e. Write 131  517    ===>  13  15  17

       and  192  123    ===>  19  21  23

So, next terms in the TWO digit sequence would be 25 27 29... And mapping these to original THREE digit form, results in 252, and so on..

   25 27 29        ===>  252  729

So, next term of given pattern will be 252.

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