A218430 - OEIS

%I #21 May 13 2023 20:00:24

%S 54,2744280,6191640,182494620,653425920,702989280,27025270272,

%T 72475361280,76172903718912,15224461545984768,1688635722988634112,

%U 5953066676035614584064,1608903162935227680030720,14600472124349965895417376,2263986000385276007625523200

%N Numbers k for which sigma(k)/k - 2/9 is an integer.

%C a(9) > 10^11. - _Donovan Johnson_, Nov 01 2012

%C a(9) > 10^12. - _Giovanni Resta_, Nov 04 2012

%C Note that there are no terms here with abundancy 11/9 (k=1) or 29/9 (k=3). - _Michel Marcus_, Jun 25 2013

%Y Cf. A218414, A160320, A218415, A218416, A160321, A218417, A218418.

%K nonn

%O 1,1

%A _Zdenek Cervenka_, Oct 28 2012

%E a(4)-a(8) from _Donovan Johnson_, Nov 01 2012

%E More terms from _Michel Marcus_, Jun 25 2013