Next Number 18 Aug 2009
What is the next number in the series
1,31,253,991,2731,  
Re: Next Number 18 Aug 2009
5473

Re: Next Number 18 Aug 2009
1,31,253,991,2731
1,222,738,1740,2742 516,1002 so now, 1740+991=2731 so 2731+2742=5473 
Re: Next Number 18 Aug 2009
i didn't get it....

Re: Next Number 18 Aug 2009
1,31,253,991,2731
1,222,738,1740,2742 These are the difference of the numbers in above series. So, the first one should be 30. And how did you get 2742? 516,1002 so now, 1740+991=2731 so 2731+2742=5473 
Re: Next Number 18 Aug 2009
yes nimes, the first number should be 30, dat was my mistake.
2742 i got like dis.... 1740+1002=2742 
Re: Next Number 18 Aug 2009
6121

Re: Next Number 18 Aug 2009
But what is so special about the other series

Re: Next Number 18 Aug 2009
No idea. I couldn't find the sequence in the OP at
http://www.research.att.com/~njas/sequences but swapping the commas for spaces they all showed up in only one sequence http://www.research.att.com/~njas/se...lish&go=Search and there were 2,5,8,11 numbers between them. 2,5,8,11 shows up in 65 sequences and has varying numbers after it, but 14 seems common. So this leads to my guess of 6121. 
Re: Next Number 18 Aug 2009
Lets see if after 24 hours what the OP replies to

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