A219223 Numbers n such that (sigma(n)-n)/(tau(n)-1) is a perfect number.

30, 121, 252, 8432, 982081, 479499604, 1912369152, 2180771840

Offset

1,1

Comments

a(9) > 10^10. - Donovan Johnson, Nov 15 2012

Links

Table of n, a(n) for n=1..8.

Formula

Numbers n such that (sigma(n)-n)/(tau(n)-1) is a perfect number.

Crossrefs

Sequence in context: A290391 A277451 A042764 * A042766 A042768 A122137

Adjacent sequences: A219220 A219221 A219222 * A219224 A219225 A219226

Keyword

nonn

Author

Zdenek Cervenka, Nov 15 2012

Extensions

a(6)-a(8) from Donovan Johnson, Nov 15 2012

Status

approved