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An Odd Pyramid (Posted on 2003-10-14) Difficulty: 3 of 5
Consider the numerical pyramid below, formed by simply putting down the series of odd numbers into a pyramid.
         3   5
       7   9   11
    13  15  17   19
      . . .
Find a formula for the sum of the numbers in the nth row, and prove it.

See The Solution Submitted by DJ    
Rating: 4.1667 (12 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionAlternative MethodologyK Sengupta2007-11-22 04:57:21
SolutionPuzzle SolutionK Sengupta2007-10-26 05:42:44
Lots of SequencesNathan Hirtz2004-12-07 07:53:30
Probably not that originalDrBob2003-10-19 12:04:53
SolutionSolutionAbhishek2003-10-19 09:30:00
re: sk, i dnt understand quite what u r getting atSilverKnight2003-10-17 14:52:43
sk, i dnt understand quite what u r getting atanand2003-10-17 14:31:01
re: re my solutionSilverKnight2003-10-17 09:31:58
re my solutionanand2003-10-17 04:21:07
re: u dont need a hammer to crack a nutSilverKnight2003-10-16 17:08:32
re(4): solution (Well done)SilverKnight2003-10-16 09:33:10
Solutionretiarius2003-10-16 05:13:03
u dont need a hammer to crack a nutanand2003-10-16 04:56:04
here is a solutionanand2003-10-16 04:54:24
re(3): solution (Well done)ratsnstuff2003-10-16 02:43:07
SolutionTriangular numbers everywhereFederico Kereki2003-10-15 09:20:23
re: Solutionethan2003-10-14 16:29:21
SolutionSolutionethan2003-10-14 16:27:24
Solutionre(2): solutionSilverKnight2003-10-14 14:35:35
re: solutionCharlie2003-10-14 14:17:41
SolutionsolutionSilverKnight2003-10-14 13:01:16
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