Hey guys, I recently stumbled across this interesting sequence:
1, 3, 5, 11, 17, 39, 65, 139, 261, 531, 1025, 2095, 4097, 8259, 16405, 32907, 65537, 131367, 262145 ...
Any ideas? The sequence appears to somewhat resemble the binary sequence.
Hey guys, I recently stumbled across this interesting sequence: 1, 3, 5, 11, 17, 39, 65, 139, 261, 531, 1025, 2095, 4097, 8259, 16405, 32907, 65537, 131367, 262145 ... Any ideas? The sequence appears to somewhat resemble the binary sequence. 

closed as off topic by Steve Huntsman, Denis Serre, François G. Dorais♦ Jun 5 '11 at 10:53Questions on MathOverflow are expected to relate to research level mathematics within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question. 


I would try this: http://oeis.org/A034729 $$ a(n) = \sum_{k, kn } 2^{(k1)}$$ In Mathematica syntax this is (see WA)


