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Parcly Taxel's user avatar
Parcly Taxel's user avatar
Parcly Taxel's user avatar
Parcly Taxel
  • Member for 7 years, 10 months
  • Last seen this week
283 votes
Accepted

Are $14$ and $21$ the only "interesting" numbers?

126 votes
Accepted

The idea behind the sum of powers of 2

77 votes
Accepted

What's the probability of choosing two numbers from $[0,1]$ and having the difference at least one half?

71 votes
Accepted

Monic polynomials whose roots are their remaining coefficients

58 votes
Accepted

Matrix determinant contradicts corresponding box volume – how is it possible?

55 votes
Accepted

Test of being a rational number for $(1-\frac13+\frac15-\frac17+\cdots)/(1+\frac14+\frac19+\frac1{16}+\cdots)$

54 votes
Accepted

Is there any other number that has similar properties as $21$?

50 votes

When to stop rolling a die in a game where 6 loses everything

48 votes
Accepted

How many ways are there to fill a 3 × 3 grid with 0s and 1s?

47 votes
Accepted

Created a function with roots at primes and only primes, are there useful applications?

42 votes

What is the smallest positive multiple of 450 whose digits are all zeroes and ones?

40 votes
Accepted

Prove that there are infinitely many primes with $666$ in their decimal representation without Dirichlet's theorem.

36 votes
Accepted

$3\times3$ matrix of distinct positive primes with determinant $0$

33 votes
Accepted

Dividing a rectangle into 4 parts in the ratio 1:2:3:4, with only 2 lines

33 votes
Accepted

"In a circle of 33, the next 10 people on my right are all liars"

32 votes

If the square root of two is irrational, why can it be created by dividing two numbers?

31 votes
Accepted

Can a parallelogram have whole-number lengths for all four sides and both diagonals?

30 votes
Accepted

4-digit password with unique digits not in ascending or descending order

29 votes
Accepted

Equation of a plane passing through 3 points

29 votes
Accepted

Why does the characteristic of a finite field always have to be prime?

29 votes
Accepted

A strange occurrence in the decimal digits of $\pi$?

28 votes
Accepted

What is the name of this 3D shape with 12 outer vertices?

26 votes
Accepted

Find mistake in simplifying rational expression

25 votes
Accepted

(Seemingly) simple trigonometry problem

25 votes
Accepted

Angle between the hour and minute hands at 6:05

25 votes
Accepted

Subset of knight's move in chess.

24 votes

Understandable questions which are hard for non-mathematicians but easy for mathematicians

22 votes
Accepted

Minimum operations to find tangent to circle

21 votes

Monic polynomial of degree 5

21 votes

Simplest way to get the lower bound $\pi > 3.14$

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