%I A028501
%S A028501 1333,1909,2469601,893748277
%N A028501 18-hyperperfect numbers: n=18(sigma(n)-n-1)+1.
%H A028501 J. S. McCranie, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">
               A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3</
               a>
%Y A028501 Cf. A007593.
%Y A028501 Sequence in context: A035862 A003907 A043613 this_sequence A145494 A043647 
               A023064
%Y A028501 Adjacent sequences: A028498 A028499 A028500 this_sequence A028502 A028503 
               A028504
%K A028501 nonn
%O A028501 1,1
%A A028501 Jud McCranie (j.mccranie(AT)comcast.net)