After the discovery of Crab, Vela, and Geminga pulsars at Very High Energies, the search for
new pulsars at tens of GeV has been gaining huge importance. However, their steep spectra
along with the sensitivity of the current generation of Imaging Atmospheric Cherenkov telescopes
(IACTs) are limiting the capability to detect more pulsars. The LST-1 is the first prototype of the
Large-Sized Telescope of the forthcoming CTA observatory with enhanced sensitivity at tens of
GeV. The LST-1 started its commissioning phase in 2018, and since then it has observed the Crab
pulsar regularly. Here, we show the first results of the analysis of the Crab and other pulsars taken
with the LST-1. The two characteristic emission peaks of the Crab pulsar, P1, and P2, are detected
with high significance showing a clear improvement in sensitivity over the previous generation
of IACTs. The spectrum is reconstructed up to 450 GeV for P1 and up to 700 GeV for P2. The
low energy threshold of LST-1 also allows us to measure the spectrum of the Crab pulsar in the
overlapping region with the Fermi-LAT and cross-calibrate both instruments. The results obtained
with the first pulsar observations with the LST-1 confirm the excellent potential of LST telescopes
to study and discover new pulsars in the near future.