Function: bernreal
Section: combinatorics
C-Name: bernreal
Prototype: Lp
Help: bernreal(n): Bernoulli number B_n, as a real number with the current
 precision.
Doc: Bernoulli number\sidx{Bernoulli numbers}
 $B_{n}$, as \kbd{bernfrac}, but $B_{n}$ is returned as a real number
 (with the current precision). The argument $n$ should be a nonnegative
 integer. The function slows down as the precision increases:
 \bprog
 ? \p1000
 ? bernreal(200000);
 time = 5 ms.
 ? \p10000
 ? bernreal(200000);
 time = 18 ms.
 ? \p100000
 ? bernreal(200000);
 time = 84 ms.
 @eprog
