OFFSET
1,1
COMMENTS
There are no other terms through 2^34. - Walter Nissen, Apr 17 2009
No more terms below 10^12. - Jud McCranie, Aug 30 2013
LINKS
G. P. Michon, Multiperfect and hemiperfect numbers
Walter Nissen, Abundancy : Some Resources
Walter Nissen, Abundancy : Some Resources
MATHEMATICA
Select[Range[100000], DivisorSigma[1, #]/# == 5/2 &] (* Robert Price, Apr 03 2019 *)
PROG
(PARI) isok(n) = sigma(n, -1) == 5/2; \\ Michel Marcus, Apr 04 2019
CROSSREFS
KEYWORD
nonn,more,bref
AUTHOR
Yasutoshi Kohmoto, May 10 2008
EXTENSIONS
Definition rewritten by M. F. Hasler, May 10 2008
First three terms confirmed by Ray Chandler, Sep 18 2008
STATUS
approved