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-   -   Next Number | 29 oct (http://www.go4expert.com/contests/next-number-29-oct-t19914/)

 Kshiteej 29Oct2009 10:39

Next Number | 29 oct

What is the next number in below series

1,3,9,29,71, ?

 shabbir 29Oct2009 14:58

Re: Next Number | 29 oct

Time Starts Now :D

 sameer_havakajoka 29Oct2009 20:33

Re: Next Number | 29 oct

134

 Kshiteej 30Oct2009 10:27

Re: Next Number | 29 oct

Quote:
 Originally Posted by sameer_havakajoka (Post 59525) 134
Nope.
How did you calculated it?

 sameer_havakajoka 30Oct2009 10:57

Re: Next Number | 29 oct

184

 sameer_havakajoka 30Oct2009 11:42

Re: Next Number | 29 oct

213

 xpi0t0s 30Oct2009 14:31

Re: Next Number | 29 oct

141

 shabbir 31Oct2009 09:49

Re: Next Number | 29 oct

Its already more than 24 hours and so new entries would not be counted and any entry before this post if correct wins or else OP wins

 Kshiteej 2Nov2009 11:17

Re: Next Number | 29 oct

Consider the difference in sucessive numbers.

3-1 = 2 = 2^2 -2 = (1st prime no )^2 - (1st prime no )
9-3 = 6 = 3^2 -3 = (2nd prime no )^2 - (2nd prime no )
29-9 = 20 = 5^2 -5 = (3rd prime no )^2 - (3rd prime no )
71-29 = 42 = 7^2 -7 = (4th prime no )^2 - (4th prime no )

So the answer is 71 + 11^2 - 11 = 181

 shabbir 2Nov2009 11:42

Re: Next Number | 29 oct

Just a suggestion. Try to reply faster if you are an OP of the competition.

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