The invention relates to an epicyclic gear reducer (10) comprising a first planet pinion (15) and a first number N1 of satellite pinions (20), the first planet pinion (15) comprising a second number N2 of the teeth (47) distributed angularly according to a first angular pitch about the first axis (Al), with the second number N2 not being an integer multiple of the first number N1, each satellite pinion (20) being movable about a respective second axis (A2), two consecutive second axes (A2) defining between them a first angle, characterised in that an angular difference D2 between at least one first angle and a second angle, equal to the result obtained from the division of 360 by the first integer N1 is in accordance with the equation: wherein N4 is a fourth integer that is a number other than zero and 1 / denotes the absolute value. Figure 1
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