Math Closed form for ∑k≥11(2k−1)a\sum_{k\geq 1}\frac{1}{(2^k-1)^a} By admin October 24, 2016 October 24, 2016 Is there a closed form for f(a)=∞∑k=11(2k−1)a,f(a)=\sum_{k=1}^\infty\frac{1}{(2^k-1)^a}, where 0 Strictly convex curves and lines Can a “not strong tangent” trace admit a C∞C^\infty curve parameterization?