Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #9 Jul 29 2013 03:48:22
%S 1,2,10,18,20,25,26,43,46,55,56,71,79,104,107,111,112,113,123,133,136,
%T 140,142,144,145,147,150,155,165,195,196,200,204,206,210,214,216,253,
%U 254,259,260,264,267,327,335,343,360,363,375,376,380,387,388,393
%N Numbers n such that S(n) = 3n (see A068119).
%t ce[n_] := Length[NestWhileList[#*Ceiling[#] &, n + 1/4, ! IntegerQ[#] &]] - 1; nn = Range[395]; t = Accumulate[ce /@ nn]; Select[nn, t[[#]] == 3*# &] (* _Jayanta Basu_, Jul 29 2013 *)
%K nonn
%O 1,2
%A _Benoit Cloitre_, Aug 30 2002