OFFSET
1,1
COMMENTS
It is easily proved that if 2^m-3 is prime then 2^(m-1)*(2^m-3) is in the sequence. - Farideh Firoozbakht, Feb 12 2008
PROG
(PARI) for(n=1, 10^8, if(sigma(n)==2*n+omega(n), print(n)))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Jason Earls, Aug 17 2001
STATUS
approved