# Next Number | 29 oct

Discussion in '\$1 Daily Competition' started by Kshiteej, Oct 29, 2009.

1. ### KshiteejNew Member

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What is the next number in below series

1,3,9,29,71, ?

2. ### shabbirAdministratorStaff Member

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Time Starts Now

3. ### sameer_havakajokaNew Member

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4. ### KshiteejNew Member

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Nope.
How did you calculated it?

5. ### sameer_havakajokaNew Member

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6. ### sameer_havakajokaNew Member

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7. ### xpi0t0sMentor

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8. ### shabbirAdministratorStaff Member

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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

9. ### KshiteejNew Member

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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

10. ### shabbirAdministratorStaff Member

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

11. ### sameer_havakajokaNew Member

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I was close...184

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