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Next number in the series...

This is a discussion on Next number in the series... within the Brainteasers forums, part of the Brain Quiz category; What is the next number in the series 1 , 2 , 4 , 13 , 31 , 112 , ? -- James....

  1. #1
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    Next number in the series...

    What is the next number in the series

    1 , 2 , 4 , 13 , 31 , 112 , ?


    -- James.


  2. #2
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    Re: Next number in the series...

    My guess about the next number appearing in the sequence is 225. Am I right?


  3. #3
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    Re: Next number in the series...

    No Stephen...225 is not the right answer.

    I'll give you a clue...look the first three numbers carefully

    -- James


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    Re: Next number in the series...

    Is the next number in the series is 211.If I am wrong kindly correct me to get the right answer.


  5. #5
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    Re: Next number in the series...

    NO. 211 is a wrong answer.


  6. #6
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    Re: Next number in the series...

    Quote Originally Posted by jamesravid View Post
    What is the next number in the series

    1 , 2 , 4 , 13 , 31 , 112 , ?


    -- James.
    I think the answer is 274...Am I correct ?


  7. #7
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    Re: Next number in the series...

    No your answer is wrong.


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    Re: Next number in the series...

    I think the answer is 213.....

    Is it correct..?


  9. #9
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    Re: Next number in the series...

    HI All,

    Th answer is 729.

    The logic is of two steps :-

    1) First of all subtract the first number from second, second from third, third from fourth and so on. You will be left with 1, 2, 9, 18, 81....

    2) The last step is divide second number by first, third by second and so on. You will automatically find the next number.

    James, please confirm.

    Thanks,
    Nikhar


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    Re: Next number in the series...

    Even I got the answer as 729.Hope our answer is correct.James have to confirm this.


  11. #11
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    Re: Next number in the series...

    729 is not the right answer. You guys have put great effort to solve this problem. So I really want some one to say 'eureka'. I am giving u a clue... look at the digits in the series none of them is more than 4


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    Smile Re: Next number in the series...

    Hi All,

    Finally i got the answer......

    The next number in the series is 224.

    Explanation....

    The Given Series is 1,2,4,13,31,112,...

    Actually the series is 1,2,4,8,16,32,....

    James convert these numbers into the base 5.

    it means ......

    5 | 8
    ----
    1 - 3


    5 | 16
    -----
    3 - 1


    5 | 32
    -----
    5 | 6 - 2
    ----
    1 - 1


    5 | 64
    ----
    5 | 12 - 4
    ----
    2 - 2

    So this series going like.. 1, 2, 4, 13, 31, 112, 224, 1003,.....

    -suresh

    Last edited by psuresh1982; 11-14-2006 at 01:21 AM.

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    Re: Next number in the series...

    Great Job Suresh!!


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