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December 19, 2014

December 19, 2014

Posted by **Jennifer** on Sunday, December 8, 2013 at 5:44pm.

- math -
**Steve**, Monday, December 9, 2013 at 12:10amthe layers are triangular numbers:

1,3,6,10, ... n(n+1)/2

The pyramid is pyramidal numbers:

1=1

1+3=4

1+3+6=10

...

1+3+...+n(n+1)/2 = n(n+1)(n+2)/6

Now just plug in n=10

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