InverseJacobiNS[v, m] gives the inverse Jacobi elliptic function ns -1 (v \[VerticalSeparator] m).
WeierstrassHalfPeriods[{g_2, g_3}] gives the half-periods {\[Omega], \[Omega]^\[Prime]} for Weierstrass elliptic functions corresponding to the invariants {g_2, g_3}.
ColorDataFunction[range, ...] is a function that represents a color scheme.
RamanujanTau[n] gives the Ramanujan \[Tau] function \[Tau](n).
Hypergeometric1F1Regularized[a, b, z] is the regularized confluent hypergeometric function \[Null]_1 F_1 (a; b; z)/\[CapitalGamma](b).
InverseGudermannian[z] gives the inverse Gudermannian function gd -1 (z).
Mathematica contains hundreds of original algorithms for computing integer functions involving integers of any size.
ParabolicCylinderD[\[Nu], z] gives the parabolic cylinder function D_\[Nu] (z).
Likelihood[dist, {x_1, x_2, ...}] gives the likelihood function for observations x_1, x_2, ... from the distribution dist.
JacobiNS[u, m] gives the Jacobi elliptic function ns(u | m).