perplexus.info :: Numbers : An Odd Pyramid

An Odd Pyramid (Posted on 2003-10-14)

Consider the numerical pyramid below, formed by simply putting down the series of odd numbers into a pyramid.

           1
         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
Alternative Methodology	K Sengupta	2007-11-22 04:57:21
Puzzle Solution	K Sengupta	2007-10-26 05:42:44
Lots of Sequences	Nathan Hirtz	2004-12-07 07:53:30
Probably not that original	DrBob	2003-10-19 12:04:53
Solution	Abhishek	2003-10-19 09:30:00
re: sk, i dnt understand quite what u r getting at	SilverKnight	2003-10-17 14:52:43
sk, i dnt understand quite what u r getting at	anand	2003-10-17 14:31:01
re: re my solution	SilverKnight	2003-10-17 09:31:58
re my solution	anand	2003-10-17 04:21:07
re: u dont need a hammer to crack a nut	SilverKnight	2003-10-16 17:08:32
re(4): solution (Well done)	SilverKnight	2003-10-16 09:33:10
Solution	retiarius	2003-10-16 05:13:03
u dont need a hammer to crack a nut	anand	2003-10-16 04:56:04
here is a solution	anand	2003-10-16 04:54:24
re(3): solution (Well done)	ratsnstuff	2003-10-16 02:43:07
Triangular numbers everywhere	Federico Kereki	2003-10-15 09:20:23
re: Solution	ethan	2003-10-14 16:29:21
Solution	ethan	2003-10-14 16:27:24
re(2): solution	SilverKnight	2003-10-14 14:35:35
re: solution	Charlie	2003-10-14 14:17:41
solution	SilverKnight	2003-10-14 13:01:16

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