OFFSET
1,1
COMMENTS
From Donovan Johnson_, Dec 19 2008: (Start)
a(9) <= 2251798907715584.
a(10) <= 633825300114085990300727115776.
a(11) <= 2596148429267411760623818083663872. (End)
a(9) > 10^13. - Giovanni Resta, Jul 13 2015
FORMULA
PROG
(PARI) for(n=1, 10^8, if(sigma(n)==2*n+bigomega(n), print(n)))
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Jason Earls, Aug 16 2001
EXTENSIONS
a(7)-a(8) from Donovan Johnson, Dec 19 2008
STATUS
approved