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.
I would try this: http://oeis.org/A034729
$$ a(n) = \sum_{k, k|n } 2^{(k-1)}$$
In Mathematica syntax this is (see W|A)
Sum[2^(k - 1), {k, Divisors[n]}]