OFFSET
1,2
PROG
(PARI) forstep(m=1, 10^6, 2, n=sqrtint(2^m-1); if(2^m-1-n^2<n, print1(m, ", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Reikku Kulon, Sep 25 2008
EXTENSIONS
Edited and extended by Max Alekseyev, Oct 12 2009
STATUS
approved