529,656 research outputs found

### On elementary estimates for sum of some functions in certain arithmetic progressions

In this paper we establish, by elementary means, estimates for the sum of some functions in certain arithmetic progressions.Comment: typos correcte

### A remark on the strong Goldbach conjecture

Under the assumption that $\sum \limits_{n\leq N}\Upsilon(n)\Upsilon(N-n)>0$, we show that for all even number $N>6$ \begin{align} \sum \limits_{n\leq N}\Upsilon(n)\Upsilon(N-n)=(1+o(1))K\sum \limits_{p|N}\sum \limits_{\substack{n\leq N/p}}\Lambda_{0}(n)\Lambda_{0}(N/p-n)\nonumber \end{align}for some constant $K>0$, and where $\Upsilon$ and $\Lambda_{0}$ denotes the master and the truncated Von mangoldt function, respectively. Using this estimate, we relate the Goldbach problem to the problem of showing that for all $N>6$ $(N\neq 2p)$, If $\sum \limits_{p|N}\sum \limits_{\substack{n\leq N/p}}\Lambda_{0}(n)\Lambda_{0}(N/p-n)>0$, then $\sum \limits_{\substack{n\leq N/p}}\Lambda_{0}(n)\Lambda_{0}(N/p-n)>0$ for each prime $p|N$.Comment: 6 pages; several corrections mad

### A new upper bound for the prime counting function $\pi(x)$

In this paper we bring to light an upper bound for the prime counting function $\pi(x)$ using elementary methods, that holds not only for large positive real numbers but for all positive reals. It puts a threshold on the number of primes $p\leq x$ for any given $x$
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