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

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

Offset: 2

Author

Lekraj Beedassy, Jun 18 2002

Keywords

• nonn
• hard
• more

Comments

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

Links

• 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.

Extensions

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