  We complete the analysis of planetary candidates found by the KMT
AnomalyFinder for the 2017 prime fields that cover $\sim 13\,{\rm deg}^2$. We
report 3 unambiguous planets: OGLE-2017-BLG-0640, OGLE-2017-BLG-1275, and
OGLE-2017-BLG-1237. The first two of these were not previously identified,
while the last was not previously published due to technical complications
induced by a nearby variable. We further report that a fourth anomalous event,
the previously recognized OGLE-2017-BLG-1777, is very likely to be planetary,
although its light curve requires unusually complex modeling because the lens
and source both have orbiting companions. One of the 3 unambiguous planets,
OGLE-2017-BLG-1275 is the first AnomalyFinder discovery that has a {\it
Spitzer} microlens parallax measurement, $\pi_E \sim 0.045\pm0.015$, implying
that this planetary system almost certainly lies in the Galactic bulge. In the
order listed, the four planetary events have planet-host mass ratios $q$, and
normalized projected separations $s$, of $(\log q,s)$ = $(-2.31,0.61)$,
$(-2.06,0.63/1.09)$, $(-2.10,1.04)$, and $(-2.86,0.72)$. Combined with
previously published events, the 2017 AnomalyFinder prime fields contain 11
unambiguous planets with well-measured $q$ and one very likely candidate, of
which 3 are AnomalyFinder discoveries. In addition to these 12, there are three
other unambiguous planets with large uncertainties in $q$.
