KleinInvariantJ[\[Tau]] gives the Klein invariant modular elliptic function J(\[Tau]).
LegendreP[n, x] gives the Legendre polynomial P_n (x). LegendreP[n, m, x] gives the associated Legendre polynomial P_n^m(x).
LerchPhi[z, s, a] gives the Lerch transcendent \[CapitalPhi] (z, s, a).
LogGamma[z] gives the logarithm of the gamma function log \[CapitalGamma](z).
LucasL
(Built-in Mathematica Symbol) LucasL[n] gives the Lucas number L_n.LucasL[n, x] gives the Lucas polynomial L_n (x).
NestList[f, expr, n] gives a list of the results of applying f to expr 0 through n times.
Nest
(Built-in Mathematica Symbol) Nest[f, expr, n] gives an expression with f applied n times to expr.
NevilleThetaD[z, m] gives the Neville theta function \[CurlyTheta]_d (z \[VerticalSeparator] m).
NevilleThetaN[z, m] gives the Neville theta function \[CurlyTheta]_n (z \[VerticalSeparator] m).
NevilleThetaS[z, m] gives the Neville theta function \[CurlyTheta]_s (z \[VerticalSeparator] m).