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Mathematical constants

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Pi
Euler's number
mathematical constant; limit of (1 + 1/n)^n as n approaches infinity; transcendental number approximately equal 2.718281828
degree
angle unit; π/180 radians
mathematical constant
special, usually real number, that is interesting or significant in some way
imaginary unit
square root of negative one, used to define complex numbers
Euler–Mascheroni constant
mathematical constant; limiting difference between the harmonic series and the natural logarithm; equal to ca 0.577
Apéry's constant
value of the Riemann zeta function when given the input 3
Catalan's constant
value of the Dirichlet beta function with two as the argument
Feigenbaum constants
mathematical constants
plastic ratio
unique real number solution to the equation x^3-x-1=0
6174
natural number
Liouville number
transcendental number possessing an excellent sequence of rational number approximations
Euler product
expansions of functions into infinite products
golden angle
division of 360° angle into two sub-angles, such that one is 1.618034 times bigger than the other (i.e. the golden ratio or ɸ)
Brun's constant
sum of reciprocals of twin primes
silver ratio
real number, second member of the sequence generalized from the golden ratio
Champernowne constant
decimal number formed by concatenating successive representations of integers
Erdős–Borwein constant
sum of the reciprocal of the Mersenne numbers
omega constant
constant such that omega*e^(omega) = 1
Gelfond's constant
e to the power of π
Gauss's constant
transcendental number; the reciprocal of the arithmetic–geometric mean of 1 and √2
Look-and-say sequence
integer sequence
Landau–Ramanujan constant
constant in number theory
sophomore's dream
mathematical constant discovered by Johann Bernoulli
Legendre's constant
the number 1, as occurring in a formula conjectured by Legendre
Gelfond–Schneider constant
two to the square root of two power
Copeland–Erdős constant
number whose decimal representation is the concatenation of "0." with the base 10 representations of the prime numbers in order
Meissel–Mertens constant
mathematical constant
Ramanujan–Soldner constant
Mathematical constant
conic constant
quantity describing conic sections
Mills' constant
prime-generating mathematical constant
list of mathematical constants
list containing mathematical constants
Khinchin's constant
mathematical constant
reciprocal Fibonacci constant
real number, approximately 3.36, the sum of the reciprocals of the Fibonacci numbers
Schnirelmann density
in additive number theory, a way to measure how dense a sequence of numbers is
Glaisher–Kinkelin constant
mathematical constant
twelfth root of two
algebraic irrational number
de Bruijn-Newman constant
mathematical constant
period
numbers expressible as integrals of algebraic functions
Stieltjes constants
numbers that occur in the Laurent series expansion of the Riemann zeta function
natural logarithm of 2
transcendental number
Cahen's constant
number, approximately 0.6434, the value of an alternating series derived from Sylvester's sequence
Lévy's constant
Hafner–Sarnak–McCurley constant
Zeta constant
numerical constants
Laplace limit
maximum eccentricity for which a power series for Kepler's equation converges
Fransén–Robinson constant
integral of 1/gamma(x) over the positive reals
Dottie number
mathematical constant related to the cosine function
supergolden ratio
unique real number solution to the equation x^3-x^2-1=0
random Fibonacci sequence
randomized mathematical sequence based upon the Fibonacci sequence
irrationality measure
Bernstein's constant
mathematical constant
Porter's constant
constant term in the average number of iterations of Euclid’s algorithm for fixed 𝑛 and averaged over all choices of relatively prime integers 𝑚<𝑛
Golomb–Dickman constant
mathematical constant
prime constant
real number whose nth binary digit is 1 if n is prime and 0 if n is composite or 1
Kepler–Bouwkamp constant
mathematical constant
Foias constant
in mathematics, the unique positive real 𝑥₁ such that the sequence 𝑥ₙ₊₁≔(1+1∕𝑥ₙ)ⁿ diverges to +∞ rather than oscillating between +∞ and 1
Niven's constant
mathematical constant
Feller–Tornier constant
Backhouse's constant
mathematical constant