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Highest prime dividing the least n-multiperfect number (A007539).
2

%I #26 Nov 14 2019 09:37:44

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

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

%C a(9) may be 16148168401 but this has not been proved. - _Charles R Greathouse IV_, May 02 2013

%H A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/mpn.html">The Multiply Perfect Number Page</a>

%H R. M. Sorli, <a href="http://www-staff.maths.uts.au/~rons/mpfn/mpfn.htm">Multiply perfect numbers</a> [Broken link]

%H R. M. Sorli, <a href="http://hdl.handle.net/10453/20034">Algorithms in the Study of Multiperfect and Odd Perfect Numbers</a>, University of Technology, Sydney, 2003.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Multiply_perfect_number">Multiply perfect number</a>

%Y Cf. A007539, A007691.

%K nonn,hard,more

%O 2,1

%A _Lekraj Beedassy_, Jun 18 2002

%E a(8) from _Sean A. Irvine_, Sep 06 2012