Here are a couple elegant series involving the golden ratio φ = (1 + √5)/2.

First, reciprocals of integer powers:

Then reciprocals of odd powers:

Both are easy to prove since they’re geometric series.

More posts related to the golden ratio:

Here are a couple elegant series involving the golden ratio φ = (1 + √5)/2.

First, reciprocals of integer powers:

Then reciprocals of odd powers:

Both are easy to prove since they’re geometric series.

More posts related to the golden ratio:

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It also then follows the sum of even powers of 1/phi (except for the zero power) is just 1/phi. Those three identities together are quite lovely.