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ViHdzP's user avatar
ViHdzP's user avatar
ViHdzP
  • Member for 4 years, 7 months
  • Last seen this week
19 votes

Is there a prime every year if YYYYMMDD is treated as a base-$10$ number?

12 votes
Accepted

Is this sequence based on the Fibonacci numbers a prime generator?

10 votes
Accepted

Find the smallest integer $n>1$ such that $\frac{1}{n}\left(1+2^2+3^2+\ldots+n^2\right)$ is a perfect square

9 votes
Accepted

Please explain the proof of the Mutilated Chessboard Problem

9 votes

Absolute convergence to a rational number

9 votes
Accepted

Formula for the area of a rhombus

8 votes
Accepted

A quadrilateral inscribed in a rectangle

8 votes
Accepted

Intuition behind Diophantine approximation: why do we express the bound as function of denominators?

7 votes
Accepted

Solving Strong Mathematical Induction Sequence

7 votes
Accepted

What is $n$ if $\frac{1+3+5 \cdots+ (2n-1)}{2+4+6+ \cdots 2n}=\frac{2017}{2018}$?

7 votes
Accepted

Find all integers $m,\ n$ such that $m^2+4n$ and $n^2+4m$ are both squares.

7 votes
Accepted

I heard there are 48 regular polyhedrons. With what Jan Misali calls regular polyhedrons, are there any more?

6 votes

Find all solutions in $\mathbb{N}$ to $a^a=a^b+b^a$

6 votes
Accepted

Moving counters on a chessboard

6 votes
Accepted

Positive integer sequence with terms that are multiples

6 votes

Growth rate of a divisor function

5 votes
Accepted

Proving $2+2^2/2+2^3/3+2^4/4+\cdots=0$ elementarily

5 votes
Accepted

The sum of оbtuse angles of а convex polygon is $2013^\circ$. How many sides does it have?

5 votes

Proof that $n^3 \leq 2^n$ for $n \geq 10$ by induction

5 votes
Accepted

Is $(1-i)^5 = 2-2i$?

5 votes

A string is chosen uniformly at random from the set of all binary strings of length n. Show that the expected number of zeroes is n/2

5 votes
Accepted

Pigeonhole principle.

4 votes

A function with a point of slope of exactly $2$

4 votes

If $x$ is irrational, is $2x - \frac{1}{x}$ irrational?

4 votes
Accepted

How many real solutions $(x,y)$ for $x + y^2 = y^3 $ and $y + x^2 = x^3$

4 votes

HAPPY NEW YEAR $2020$ Remainder Problem

4 votes
Accepted

Factoring $F_{1001}$

4 votes
Accepted

Extra lottery numbers

4 votes

I can't understand how probability makes sense

4 votes

How many 5 digit numbers can be constructed using the following digits: 62664277?

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