1,1

Cf. A127724 (k-imperfect numbers).

Sequence in context: A110953 A003683 A098519 this_sequence A048014 A094702 A001621

Adjacent sequences: A127722 A127723 A127724 this_sequence A127726 A127727 A127728

nonn

T. D. Noe (noe(AT)sspectra.com), Jan 25 2007