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 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)

 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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