Next Number 18 Aug 2009

Discussion in '$1 Daily Competition' started by Kshiteej, Aug 18, 2009.

  1. Kshiteej

    Kshiteej New Member

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    What is the next number in the series

    1,31,253,991,2731, -
     
  2. Seema786

    Seema786 New Member

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  3. Seema786

    Seema786 New Member

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    1,31,253,991,2731

    1,222,738,1740,2742

    516,1002

    so now,

    1740+991=2731

    so

    2731+2742=5473
     
  4. mayjune

    mayjune New Member

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    i didn't get it....
     
  5. nimesh

    nimesh New Member

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    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
     
  6. Seema786

    Seema786 New Member

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    yes nimes, the first number should be 30, dat was my mistake.

    2742 i got like dis....

    1740+1002=2742
     
  7. xpi0t0s

    xpi0t0s Mentor

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  8. shabbir

    shabbir Administrator Staff Member

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    But what is so special about the other series
     
  9. xpi0t0s

    xpi0t0s Mentor

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  10. shabbir

    shabbir Administrator Staff Member

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    Lets see if after 24 hours what the OP replies to
     
  11. shabbir

    shabbir Administrator Staff Member

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    Kshiteej, Its more than 24 hours and so please update the question and tell us who is the winner.
     
  12. Kshiteej

    Kshiteej New Member

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    Ans is 6121.
    31-1 = 30 = (3)^3 +3
    253-31 = 222 = (6)^3 + 6
    991 -253 = 738 = (9)^3 + 9
    2731 - 991 =1740 =(12)^3 + 12
    so te ans will be 2731 + (15)^3 + 15 =6121
     
  13. shabbir

    shabbir Administrator Staff Member

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    So Congrats xpi0t0s
     
  14. mayjune

    mayjune New Member

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    very nice one kshiteej...
     
  15. Kshiteej

    Kshiteej New Member

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    Thanks Mayjune and congrats xpi0t0s.

    By the way what was your logic while calculating 6121? The same as of mine??
     
  16. nimesh

    nimesh New Member

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    nice question kshiteej
     
  17. naimish

    naimish New Member

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    Congrs xpi0t0s :D
     
  18. xpi0t0s

    xpi0t0s Mentor

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    Heh, no, I did it in a spreadsheet and made a BIG assumption...column A contained the original sequence in A1-A5; B2=A2-A1 and copied the formula to B3-B5, C3-C5, D4-D5 and E5. I assumed that was the end of it and that the next row, if it existed, would end with E6=E5 and worked backwards to find out what would be in D6, C6, B6 and A6, and that's where I got 6121 from.

    Then I looked up the sequence in the sequences database as explained (and linked) earlier in the thread.
     

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