That, of course, is for a single-pole filter which has the low rolloff rate of 6dB/octave.F = 1 / 2pi*R*C, therefore R = 1 / 2pi*F*C, or C = 1 / 2pi*R*F
In the reasonable value range, one answer out of many is 22.6K and 100pF.
by Jake Hertz
by Aaron Carman