  We report the results of X-ray and gamma-ray analyses of the nova V1716 Sco
taken by Swift, NICER, NuSTAR and F ermi-LAT. We have detected gamma-ray
emission at a significant level exceeding 8 {\sigma} in daily bins starting the
day after the optical eruption. The gamma-ray emission, characterized by a Test
Statistic (TS) value more than four, persisted for approximately 40 days.
Notably, harder X-ray emission were observed by NuSTAR as the start of
gamma-ray emission, which is the fourth classical nova that gamma-ray emission
is concurrent with harder X-ray emission from NuSTAR data. V1716 Sco is one of
rare samples that clearly shows a hard X-ray emission (1-10 keV bands) in the
Swift-XRT data concurrently with gamma-ray emission of Fermi-LAT data, and its
light curve in 1.0-10.0 keV bands had a peak at about 20 days after the optical
eruption. The X-ray spectrum was initially fitted by a model of thermal plasma
emission, and entered a supersoft phase with additional blackbody (BB)
component emerged around about 40 days after the optical eruption. NICER data
taken in supersoft source phase revealed a quasi-periodic oscillation with a
period of 79.10+-1.98 seconds, and the peak phase of the folded light curve
varied with time. Moreover, V1716 Sco is the another example that the emission
radius in supersoft source phase is significantly larger than the radius of
white dwarf, and a simple BB emission model may not be applicable since the
luminosity exceeds significantly Eddington limit.
