OFFSET
1,1
COMMENTS
a(n)=0 mod(3).
The next term (a(8)) has 152 digits and a(9) has 217 digits. - Harvey P. Dale, Oct 20 2014
MATHEMATICA
Select[Table[(2^n+1)/n, {n, 300}], IntegerQ] (* Harvey P. Dale, Oct 20 2014 *)
PROG
(PARI) lista(nn) = {for (n=1, nn, if (type(v = (2^n+1)/n) == "t_INT", print1(v, ", ")); ); } \\ Michel Marcus, Nov 20 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 19 2002
STATUS
approved