Cu-63 NMR measurements have been carried out in HgBa2Ca2Cu3O8+delta (H
g1223) with the highest transition temperature, T-c = 133 K, to date.
The narrow NMR spectrum and the small residual density of states (DOS)
, N-res, at the Fermi level in the superconducting state indicate that
the Hg1223 possesses good quality.