shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Quote:
Originally Posted by shabbir View Post
Lets see if after 24 hours what the OP replies to
Kshiteej, Its more than 24 hours and so please update the question and tell us who is the winner.
Kshiteej's Avatar, Join Date: Jul 2009
Contributor
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
nimesh, xpi0t0s likes this
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
So Congrats xpi0t0s
xpi0t0s like this
mayjune's Avatar, Join Date: Jun 2009
Invasive contributor
very nice one kshiteej...
Kshiteej's Avatar, Join Date: Jul 2009
Contributor
Thanks Mayjune and congrats xpi0t0s.

By the way what was your logic while calculating 6121? The same as of mine??
nimesh's Avatar, Join Date: Apr 2009
Invasive contributor
nice question kshiteej
naimish's Avatar
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Congrs xpi0t0s
xpi0t0s's Avatar, Join Date: Aug 2004
Mentor
Quote:
Originally Posted by Kshiteej View Post
Thanks Mayjune and congrats xpi0t0s.

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