Nested radical constant
From specialfunctionswiki
The nested radical constant $C$ is given by $$C=\sqrt{1+\sqrt{2+\sqrt{3+\sqrt{4+\sqrt{5+\ldots}}}}}.$$
The nested radical constant $C$ is given by $$C=\sqrt{1+\sqrt{2+\sqrt{3+\sqrt{4+\sqrt{5+\ldots}}}}}.$$