BaseForm (Built-in Mathematica Symbol)

BaseForm[expr, n] prints with the numbers in expr given in base n.

BellB (Built-in Mathematica Symbol)

BellB[n] gives the Bell number B_n. BellB[n, x] gives the Bell polynomial B_n (x).

CarmichaelLambda (Built-in Mathematica Symbol)

CarmichaelLambda[n] gives the Carmichael function \[Lambda](n), defined as the smallest integer m such that k^m \[Congruent] 1 mod n for all k relatively prime to n.

Factorial2 (Built-in Mathematica Symbol)

n!! gives the double factorial of n.

GCD (Built-in Mathematica Symbol)

GCD[n_1, n_2, ...] gives the greatest common divisor of the n_i.

HessenbergDecomposition (Built-in Mathematica Symbol)

HessenbergDecomposition[m] gives the Hessenberg decomposition of a matrix m.

Hyperlink (Built-in Mathematica Symbol)

Hyperlink[uri] represents a hyperlink that jumps to the specified URI when clicked. Hyperlink[label, uri] represents a hyperlink to be displayed as label.

LatticeReduce (Built-in Mathematica Symbol)

LatticeReduce[{v_1, v_2, ...}] gives a reduced basis for the set of vectors v_i.

LCM (Built-in Mathematica Symbol)

LCM[n_1, n_2, ...] gives the least common multiple of the n_i.

ModularLambda (Built-in Mathematica Symbol)

ModularLambda[\[Tau]] gives the modular lambda elliptic function \[Lambda](\[Tau]).