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BernoulliB

Bernoulli number.

$ wo 'BernoulliB[4]'
-1/30

With a second argument it is the Bernoulli polynomial B_n(x).

$ wo 'BernoulliB[2, x]'
1/6 - x + x^2

$ wo 'BernoulliB[3, z]'
z/2 - (3*z^2)/2 + z^3

N numericizes the coefficients but leaves the exponents exact, so the result is still a polynomial that Solve can find the roots of.

$ wo 'N[BernoulliB[3, z]]'
0.5*z - 1.5*z^2 + z^3

$ wo 'Solve[N[BernoulliB[3, z]] == 0, z]'
\{\{z -> 0\.\}, \{z -> 0\.5(0+\d*)?\}, \{z -> 1\.\}\} (regex)