OFFSET
1,2
COMMENTS
It is conjectured that all the terms of this sequence are integers; this may be equivalent to the conjecture at A131853.
MATHEMATICA
t = Table[IntegerDigits[n, 2], {n, 1, 3000}];
b[n_] := Reverse[Table[x^k, {k, 0, n}]]
p[n_, x_] := p[n, x] = t[[n]].b[-1 + Length[t[[n]]]]
TableForm[Table[{n, p[n, x], Factor[p[n, x]]},
{n, 1, 16}]]
u = {}; Do[n++; If[(p[n, x] /. x -> I) == 0,
AppendTo[u, n]], {n, 800}]
u (* A206715 *)
u/5 (* A206716 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Feb 11 2012
STATUS
approved