A160321 - OEIS

%I #15 Jun 28 2018 07:17:21

%S 84,270,1488,1638,24384,35640,199584,2142720,12999168,100651008,

%T 208565280,240589440,470564640,3899750400,6039429120,25769607168,

%U 36639203328,53798734080,231758392320,314039721600,412316073984,5566503720960,5967138078720,302512616524800

%N Numbers n for which sigma(n)/n=k+2/3 with integer k.

%e 84 is in the sequence because sigma(84)/84=224/84=2+2/3

%e 270 is in the sequence because sigma(270)/270=720/270=2+2/3

%Y Cf. A160320 (sigma(n)/n=k+1/3), A159907 (sigma(n)/n=k+1/2).

%K nonn

%O 1,1

%A J.C.Klein (hklein(AT)planet.nl), May 08 2009

%E a(10)-a(18) from _Donovan Johnson_, May 26 2009

%E a(19)-a(24) from _Michel Marcus_, Sep 21 2012