User Parcly Taxel - Mathematics Stack Exchange

283 votes

Accepted

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

answered Nov 2, 2016 at 15:05

127 votes

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The idea behind the sum of powers of 2

answered Oct 29, 2016 at 11:05

77 votes

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

answered Feb 19, 2018 at 14:54

71 votes

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Monic polynomials whose roots are their remaining coefficients

answered Mar 13, 2018 at 14:34

58 votes

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

answered Dec 4, 2017 at 5:10

55 votes

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

answered Aug 24, 2016 at 17:23

54 votes

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

answered Mar 1, 2019 at 8:13

50 votes

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

answered Oct 20, 2016 at 12:45

48 votes

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

answered Oct 23, 2017 at 6:36

47 votes

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

answered Jan 29, 2018 at 10:25

42 votes

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

answered Aug 25, 2016 at 15:14

40 votes

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

answered Sep 22, 2017 at 15:04

36 votes

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

answered Feb 1, 2018 at 13:11

33 votes

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

answered Feb 9, 2018 at 11:11

33 votes

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

answered Dec 1, 2017 at 1:19

32 votes

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

answered Oct 25, 2016 at 6:57

31 votes

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

answered Feb 28, 2018 at 17:10

30 votes

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Equation of a plane passing through 3 points

answered Mar 11, 2018 at 16:34

30 votes

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

answered Oct 28, 2016 at 8:51

29 votes

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

answered Sep 22, 2017 at 4:50

29 votes

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

answered Dec 27, 2020 at 4:00

28 votes

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

answered Dec 8, 2017 at 14:44

26 votes

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Find mistake in simplifying rational expression

answered Jan 28, 2018 at 12:50

25 votes

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(Seemingly) simple trigonometry problem

answered Oct 26, 2016 at 8:12

25 votes

Accepted

Angle between the hour and minute hands at 6:05

answered Aug 16, 2016 at 12:44

25 votes

Accepted

Subset of knight's move in chess.

answered Jun 27, 2019 at 18:36

24 votes

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

answered Feb 28, 2018 at 10:02

22 votes

Accepted

Minimum operations to find tangent to circle

answered Oct 10, 2016 at 4:23

21 votes

Monic polynomial of degree 5

answered May 7, 2017 at 15:45

21 votes

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

answered Oct 23, 2017 at 7:12

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3,177 Answers

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

The idea behind the sum of powers of 2

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

Monic polynomials whose roots are their remaining coefficients

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

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

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

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

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

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

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

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

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

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

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

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

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

Equation of a plane passing through 3 points

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

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

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

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

Find mistake in simplifying rational expression

(Seemingly) simple trigonometry problem

Angle between the hour and minute hands at 6:05

Subset of knight's move in chess.

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

Minimum operations to find tangent to circle

Monic polynomial of degree 5

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