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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