A072002 Highest prime dividing the least n-multiperfect number (A007539).

3, 5, 7, 19, 257, 599479, 649657

Offset

2,1

Comments

a(9) may be 16148168401 but this has not been proved. - Charles R Greathouse IV, May 02 2013

Links

Table of n, a(n) for n=2..8.

A. Flammenkamp, The Multiply Perfect Number Page

R. M. Sorli, Multiply perfect numbers [Broken link]

R. M. Sorli, Algorithms in the Study of Multiperfect and Odd Perfect Numbers, University of Technology, Sydney, 2003.

Wikipedia, Multiply perfect number

Crossrefs

Cf. A007539, A007691.

Sequence in context: A154526 A126144 A171643 * A217651 A362417 A352710

Adjacent sequences: A071999 A072000 A072001 * A072003 A072004 A072005

Keyword

nonn,hard,more

Author

Lekraj Beedassy, Jun 18 2002

Extensions

a(8) from Sean A. Irvine, Sep 06 2012

Status

approved