Mathematical constant

Cahen's constant Square root of 7 Square root of 6 square root of 3 conic constant Foias constant pi imaginary unit Shannon number magic constant tau square root of 5 plastic number silver ratio Khinchin's constant Bernstein's constant Gelfond's constant Porter's constant reciprocal Fibonacci constant square root of 2 golden ratio Dottie number twelfth root of two Apéry's constant magic angle Feigenbaum constants prime constant Legendre's constant Chaitin's constant Seshadri constant structure constants universal parabolic constant Euler's constant Catalan's constant