A159271 Numbers with abundancy index sigma(n)/n = 11/2.

17116004505600, 75462255348480000, 6219051710415667200, 14031414189615513600, 352444116692828160000, 835095457414213632000, 59485231752222033838080, 64031599488357236736000

Offset: 1

Author

M. F. Hasler, Apr 21 2009

Keywords

• nonn

Links

• Michel Marcus, Table of n, a(n) for n = 1..117
• G. P. Michon and M. Marcus, Hemiperfect numbers of abundancy 11/2 (table with factorizations). [From _Gerard P. Michon_, Jul 01 2009]
• Walter Nissen, Abundancy : Some Resources

Programs

PARI

is(n)=sigma(n,-1)==11/2 \\ Charles R Greathouse IV, Mar 09 2014