login
A218415
Numbers k for which sigma(k)/k - 4/9 is an integer.
5
9, 1782, 2160, 5400, 13104, 52141320, 117641160, 173365920, 6829038720, 12415092480, 13356796320, 104381747712, 513480135168, 1377031864320, 6578372828160, 26896578508800, 294208373809152, 1447285170659328, 3151812152130048, 7734746166732288
OFFSET
1,1
COMMENTS
a(12) > 10^11. - Donovan Johnson, Nov 01 2012
a(14) > 10^12. - Giovanni Resta, Nov 04 2012
KEYWORD
nonn
AUTHOR
Zdenek Cervenka, Oct 28 2012
EXTENSIONS
a(6)-a(11) from Donovan Johnson, Nov 01 2012
a(12)-a(13) from Giovanni Resta, Nov 04 2012
More terms from Michel Marcus, Jun 25 2013
STATUS
approved