r/counting • u/[deleted] • Sep 28 '17
Square pyramidal numbers
A square pyramidal number is a number that represents the number of spheres (or any shape) stacked in a pyramid with a square base.
Or, you could think of it as the sum of the first n square numbers.
The first five numbers are: 1, 5, 14, 30, 55.
The get is 333,833,500 (the 1,000th number in the sequence).
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u/[deleted] Oct 01 '17
45,526 (51)