HurwitzZeta[s, a] gives the Hurwitz zeta function \[Zeta](s, a).
Hypergeometric0F1[a, z] is the confluent hypergeometric function \[Null]_0 F_1 (; a; z).
InverseBetaRegularized[s, a, b] gives the inverse of the regularized incomplete beta function.
InverseErfc[s] gives the inverse complementary error function obtained as the solution for z in s = erfc(z).
InverseGammaRegularized[a, s] gives the inverse of the regularized incomplete gamma function.
InverseWeierstrassP[p, {g_2, g_3}] gives a value of u for which the Weierstrass function \[WeierstrassP] (u; g_2, g_3) is equal to p.
JacobiP
(Built-in Mathematica Symbol) JacobiP[n, a, b, x] gives the Jacobi polynomial P_n^(a, b)(x).
NevilleThetaC[z, m] gives the Neville theta function \[CurlyTheta]_c (z \[VerticalSeparator] m).
SpheroidalS1[n, m, \[Gamma], z] gives the radial spheroidal function S_n^m, (1)(\[Gamma], z) of the first kind.
StruveH
(Built-in Mathematica Symbol) StruveH[n, z] gives the Struve function H n (z).