A218415 Numbers k for which sigma(k)/k - 4/9 is an integer.

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

Links

Table of n, a(n) for n=1..20.

Crossrefs

Cf. A218414, A218430, A160320, A218416, A160321, A218417, A218418.

Sequence in context: A246115 A068182 A368368 * A194135 A114224 A201845

Adjacent sequences: A218412 A218413 A218414 * A218416 A218417 A218418

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