1. We have moved from vBulletin to XenForo and you are viewing the site in the middle of the move. Though the functional aspect of everything is working fine, we are still working on other changes including the new design on Xenforo.
    Dismiss Notice

Next Number 18 Aug 2009

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

  1. Kshiteej

    Kshiteej New Member

    What is the next number in the series

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

    Seema786 New Member

  3. Seema786

    Seema786 New Member

    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

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

    nimesh New Member

    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

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

    2742 i got like dis....

    1740+1002=2742
     
  7. xpi0t0s

    xpi0t0s Mentor

  8. shabbir

    shabbir Administrator Staff Member

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

    xpi0t0s Mentor

  10. shabbir

    shabbir Administrator Staff Member

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

    shabbir Administrator Staff Member

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

    Kshiteej New Member

    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

    So Congrats xpi0t0s
     
  14. mayjune

    mayjune New Member

    very nice one kshiteej...
     
  15. Kshiteej

    Kshiteej New Member

    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

    nice question kshiteej
     
  17. naimish

    naimish New Member

    Congrs xpi0t0s :D
     
  18. xpi0t0s

    xpi0t0s Mentor

    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.
     

Share This Page