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2d
answered Prime counting function; when is it true that $\pi(n) > \pi(2n) -\pi(n)$?
Feb
8
answered Limit of the sequence $\lim_\limits{n\to\infty}\sin(2\pi(n^2+n^{1/2})^{1/2})$.
Feb
5
answered Proof of divisibility: $17 \mid 3 \cdot 5^{2015} + 2^{2017} \cdot 5^{670}$
Feb
3
answered How to calculate number combinations of formulas for a number of propositions
Jan
27
answered Number of ways to roll five 6-sided dice with sum 7
Jan
26
answered First Fibonacci Number with Given Remainder
Jan
25
answered Distance between the nullpoints of the series of derivatives of ln(x)/x
Jan
20
answered Is the sum of random variables X and X 2X?
Jan
19
answered What's the period of $\sin \left(x^\frac{3}{2}\right)$?
Jan
18
answered Why is $\cos^2(2\pi/5) + \cos^2(4\pi/5)=3/4$?
Jan
12
answered Make $f(x)=\sin x-\frac{x+ax^3}{1+bx^2}$ be the infinitesimal of the highest order
Jan
8
answered Number of connected sets of size $k$ containing a given vertex on $\mathbb{Z}^d$
Dec
18
answered Calculate the determinant of the matrices $a_{ij}=\frac{1}{i+j-1}$ and $b_{ij}=\frac{1}{i+j}$?
Dec
12
answered How can I create 14 unique team rosters from 24 students in groups of 2?
Dec
10
answered asymptotic approximation for number of partitions of integer that do contain 1 nor 2
Nov
4
answered Simplify $\sqrt{7+4\sqrt{3}}+\sqrt{28-10\sqrt{3}}$
Oct
21
answered Is there any density function such that the center of mass of a semicircle about its diameter is half its radius?
Oct
16
answered Minimum number of fractions to be summed up to $\frac45$
Jun
9
answered Solving recurrence similar to Catalan number recurrence
Jun
3
answered Name of the highest power of 2 smaller than or equal to a given number