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visits | member for | 1 year, 9 months |
seen | 42 mins ago | |
stats | profile views | 7,563 |
May 11 |
reviewed | Close two tailed unequal variance t-test |
May 11 |
comment |
Primes p=4k+1 such that k!+1 is divisible by p
@RolandBacher: Note throughout that $a^2+b^2=p$. Note that for example $37=1^2+6^2$, so you can't take $a=-3$ there. (What's being used at the end is that there's essentially only one way to write a prime $p\equiv 1\pmod 4$ as a sum of two squares.) |
May 11 |
reviewed | Leave Open Sums of sets of lower density 0 |
May 10 |
awarded | Enlightened |
May 10 |
comment |
A question on the bounds of the $n$-th composite $c_n$
I take back my comment and vote. The question is asking something weaker like $\pi(c_{x}) +\pi(c_y) \ge \pi(x+y)$, which would follow from precise enough versions of the prime number theorem. |
May 10 |
reviewed | Close A question on the bounds of the $n$-th composite $c_n$ |
May 10 |
comment |
A question on the bounds of the $n$-th composite $c_n$
I'm voting to close, since this is essentially the well known Hardy-Littlewood conjecture that $\pi(x) +\pi(y) \ge \pi(x+y)$ which is believed to be false. |
May 10 |
awarded | Nice Answer |
May 10 |
answered | Completely multiplicative functions with values in $\{-1,1\}$ |
May 9 |
comment |
Are there always at least *five* divisions?
Yes, this also follows easily by just dividing $p$ into the possible residue classes $\pmod 8$, and doing some simple algebra. |
May 8 |
reviewed | Close probability in galton watson processes |
May 8 |
reviewed | Leave Open Are There Infinitly Many $n$ Which $a\times n!+1$ Be Composite? |
May 8 |
reviewed | No Action Needed Intuition and/or visualisation of Ito integral/Ito's lemma |
May 6 |
reviewed | Approve expectation involving normal pdf and Rayleigh distribution |
May 6 |
reviewed | Close Backlund counting formula for Dirichlet L-functions? |
May 6 |
comment |
Sums of two squares: positive lower density?
I'm voting to close this question as off-topic because this was already mentioned in the linked question. |
May 6 |
reviewed | No Action Needed Around Vopěnka: Accessible category with small full discrete subcategories of arbitrary size? |
May 6 |
reviewed | Leave Open Sums of sets of lower density 0 |
May 6 |
reviewed | Leave Open help with an asymptotic estimate for a certain product |
May 6 |
reviewed | No Action Needed smooth minimization of piecewise linear convex function |