Let $$f:M\rightarrow M$$
f
:
M
→
M
be a self-map of a compact manifold and $$n\in {\mathbb {N}}$$
n
∈
N
. In general, the least number of n-periodic points in the smooth homotopy class of f may be much bigger than in the continuous homotopy class. For a class of spaces, including compact Lie groups, a necessary condition for the equality of the above two numbers, for each iteration $$f^n$$
f
n
, appears. Here we give the explicit form of the graph of orbits of Reidemeister classes $$\mathcal {GOR}(f^*)$$
GOR
(
f
∗
)
for self-maps of projective unitary group PSU(2) and of $$PSU(2)\times PSU(2)$$
P
S
U
(
2
)
×
P
S
U
(
2
)
satisfying the necessary condition. The structure of the graphs implies that for self-maps of the above spaces the necessary condition is also sufficient for the smooth minimal realization of n-periodic points for all iterations.