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VividD's user avatar
VividD's user avatar
VividD
  • Member for 10 years, 4 months
  • Last seen more than 3 years ago
45 votes
Accepted

Is ${F_{n}}^2 - 28$ always a composite number?

36 votes

Can you be 1/12th Cherokee?

31 votes

For the Fibonacci numbers, show for all $n$: $F_1^2+F_2^2+\dots+F_n^2=F_nF_{n+1}$

28 votes

Show me some pigeonhole problems

22 votes

Only 12 polynomials exist with given properties

18 votes
Accepted

Technique for proving four given points to be concyclic?

14 votes

Is an empty parenthesis a valid mathematical expression?

12 votes

Software to render formulas to ASCII art

11 votes
Accepted

Prove or disprove that ${F_{n}}^2 + 41$ is always a composite (if $F_{n}$ is $n^{th}$ Fibonacci number)

10 votes

Is $n! + 1$ often a prime?

10 votes

Can I represent groups geometrically?

9 votes
Accepted

A Geometric Proof of $\zeta(2)=\frac{\pi^2}6$? (and other integer inputs for the Zeta)

8 votes

Splitting a sandwich and not feeling deceived

8 votes

King and knight moving on an infinite chess board

7 votes

Are there any visual proofs for $\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}$?

5 votes

Visualization of Eratosthenes’ sieve

5 votes
Accepted

Effect on existing roots of polynomial when adding small higher-order term

5 votes
Accepted

Well-posed vs Well-conditioned

4 votes

Identification of a quadrilateral as a trapezoid, rectangle, or square

4 votes

Smallest number of points on plane that guarantees existence of a small angle

4 votes

Why represent a complex number $a+ib$ as $[\begin{smallmatrix}a & -b\\ b & \hphantom{-}a\end{smallmatrix}]$?

4 votes

Visual Proofs of Series Summations

4 votes
Accepted

Remarkable relation between Fibonacci numbers and its squares!

3 votes

Unusual mathematical terms

3 votes
Accepted

Pigeonhole principle and room full of flies

3 votes
Accepted

Are there 3D geometric proofs of Fibonacci identities?

3 votes

Problem with $20$ integers less than $70$

3 votes

Visual Proofs of Series Summations

3 votes

Generalizations of the golden and silver ratios, and their significance

3 votes

Are there infinitely many primes of the form $n!+1$?