Question

Friendship theorem for bipartite graphs

score 166 · Answer 1 · 2023-03-15 12:19:39

166

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Friendship theorem for bipartite graphs

Published on 15 Mar 2023 - 12:19

score 169 · Answer 2 · 2023-03-15 12:56:42

169

Views

Formula for the ratio of Numbers not divisible by the first n primes

Published on 15 Mar 2023 - 12:56

score 91 · Answer 3 · 2023-03-16 08:44:07

91

Views

Conjecture about the minimum of the Gamma function

Published on 16 Mar 2023 - 8:44

score 183 · Answer 4 · 2023-03-20 13:13:15

183

Views

Conjecture: Shallow diagonals in Pascal's triangle form polynomials whose roots are all real, distinct, and in $(-2,2)$.

Published on 20 Mar 2023 - 13:13

score 170 · Answer 5 · 2023-03-23 03:01:02

170

Views

Collatz conjecture - Why does it end and not go on to infinity?

Published on 23 Mar 2023 - 3:01

score 46 · Answer 6 · 2023-03-24 22:11:39

46

Views

Prove this conjecture: Two lists of vectors are in the same orientation iff this transformation exists

Published on 24 Mar 2023 - 22:11

score 123 · Answer 7 · 2023-03-31 00:33:02

123

Views

Possible connection between binary numbers and $\pi$

Published on 31 Mar 2023 - 0:33

score 89 · Answer 8 · 2026-03-27 05:37:39

89

Views

A problem on the divisibility of central binomial coefficient

Published on 27 Mar 2026 - 5:37

score 91 · Answer 9 · 2023-04-04 19:55:18

91

Views

Equivalent definition of convergence of a sequence in $\mathbb{R}$

Published on 04 Apr 2023 - 19:55

score 296 · Answer 10 · 2023-04-14 09:57:38

296

Views

Differences between primes which are powers of two

Published on 14 Apr 2023 - 9:57

score 181 · Answer 11 · 2026-03-26 13:46:37

181

Views

Does an odd perfect number have a divisor (other than $1$) which must necessarily be almost perfect?

Published on 26 Mar 2026 - 13:46

score 190 · Answer 12 · 2023-05-02 16:20:07

190

Views

The Connell Sequence and the Number of Ones in Redheffer Matrices

Published on 02 May 2023 - 16:20

score 393 · Answer 13 · 2026-03-26 13:47:58

393

Views

Under what conditions is it true that $m^2 - a$ is not a square if and only if $(m - 1)^2 < m^2 - a < m^2$, where $a>0$?

Published on 26 Mar 2026 - 13:47

score 105 · Answer 14 · 2026-03-27 16:20:09

105

Views

Conjecture about expected distance between two points in a regular polygon

Published on 27 Mar 2026 - 16:20

score 100 · Answer 15 · 2026-02-23 07:23:02

100

Views

Reference Request - Online copy of R. Graham's "On Finite Sums of Rational Numbers"

Published on 23 Feb 2026 - 7:23

List Question

Friendship theorem for bipartite graphs

Formula for the ratio of Numbers not divisible by the first n primes

Conjecture about the minimum of the Gamma function

Conjecture: Shallow diagonals in Pascal's triangle form polynomials whose roots are all real, distinct, and in $(-2,2)$.

Collatz conjecture - Why does it end and not go on to infinity?

Prove this conjecture: Two lists of vectors are in the same orientation iff this transformation exists

Possible connection between binary numbers and $\pi$

A problem on the divisibility of central binomial coefficient

Equivalent definition of convergence of a sequence in $\mathbb{R}$

Differences between primes which are powers of two

Does an odd perfect number have a divisor (other than $1$) which must necessarily be almost perfect?

The Connell Sequence and the Number of Ones in Redheffer Matrices

Under what conditions is it true that $m^2 - a$ is not a square if and only if $(m - 1)^2 < m^2 - a < m^2$, where $a>0$?

Conjecture about expected distance between two points in a regular polygon

Reference Request - Online copy of R. Graham's "On Finite Sums of Rational Numbers"

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