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 Mar 16 accepted Earth population growth rate is exponential or logarithmic? Feb 18 accepted Is $\lim na_n \to 0$ sufficient for $\sum a_n$ to converge? Feb 7 accepted Is there any partial sums of harmonic series that is integer? Jan 14 accepted Example of two analytic functions that differ at countably infinity many point Nov 29 accepted Ellipse by moving center of a parametric circle equation? Nov 12 accepted Convergence rate for $a_{n+1}=\sqrt{2 \sqrt {a_n}}$? Nov 8 accepted Equation of 3 circles touching each other is given, what is the equation of a circle touching all 3? Sep 25 accepted Limit of $\sum\limits_{k=1}^n \frac{1}{2k-1}-\frac12\ln n$ Sep 22 accepted Do definite Riemann integrals have a uniqe Riemann sums? Sep 15 accepted what is mathematical description of parabola produced by intersection of two evolving circles? Sep 13 accepted Does every integer occur finitely many times and in what positions in Pascal's triangle? Sep 9 accepted Are Square and equilateral triangle the only convex regular ngons that can be composed to smaller versions of themselves? Aug 11 accepted What this type of identities are called ? e.g. “expression containing no value/constant = value/constant” Aug 3 accepted What is the symbol for primes? Jul 16 accepted Ternary equivalence relations that are not equivalent to some binary equivalance Jun 5 accepted what is the parametric form for “mystery curve”? May 28 accepted n points can be equidistant from each other only in dimensions $\ge n-1$? Apr 19 accepted How to generate complicated looking identities such as $\sqrt [3] {2 + \sqrt 5} - \sqrt [3] {2 - \sqrt 5}=1$ easily? Jan 14 accepted How often is $1+\prod_{k=1}^n p_k$ not prime? Dec 31 accepted What are solutions to $2^x=x$?