Divisors[n] gives a list of the integers that divide n.
FiniteAbelianGroupCount[n] gives the number of finite Abelian groups of order n.
JacobiSymbol[n, m] gives the Jacobi symbol (n/m).
MachinePrecision is a symbol used to indicate machine-number precision.
NCache
(Built-in Mathematica Symbol) NCache[x, xn] represents a numeric cache object for a quantity with exact value x and approximate numerical value xn.
$Aborted is a special symbol that is returned as the result from a calculation that has been aborted.
WaveletFilterCoefficients[wave, filt] gives the filter coefficients for the symbolic wavelet wave of type filt.
BarabasiAlbertGraphDistribution[n, k] represents a Barabasi\[Dash]Albert graph distribution for n-vertex graphs where a new vertex with k edges is added at each step.
NumericFunction is an attribute that can be assigned to a symbol f to indicate that f[arg_1, arg_2, ...] should be considered a numeric quantity whenever all the arg_i are ...
Gamma
(Built-in Mathematica Symbol) Gamma[z] is the Euler gamma function \[CapitalGamma](z). Gamma[a, z] is the incomplete gamma function \[CapitalGamma](a, z). Gamma[a, z_0, z_1] is the generalized incomplete ...