Question

Permutations of a $4\times4$ grid generated by permutations of rows, columns, and $2\times2$ quadrants

score 56 · Answer 1 · 2026-03-25 06:29:18

56

Views

Permutations of a $4\times4$ grid generated by permutations of rows, columns, and $2\times2$ quadrants

Published on 25 Mar 2026 - 6:29

score 38 · Answer 2 · 2026-04-13 18:43:46

38

Views

Creating p-interesting graphs

Published on 13 Apr 2026 - 18:43

score 102 · Answer 3 · 2026-04-15 23:33:16

102

Views

Interesting find in integrating $f(\text{x})=e^{i \pi x} \left(1-(x+1)^{\frac{1}{x+1}}\right).$ Why?

Published on 15 Apr 2026 - 23:33

score 226 · Answer 4 · 2026-04-17 03:03:44

226

Views

$\sum_{d|n} \phi (\tau (d))=?$

Published on 17 Apr 2026 - 3:03

score 129 · Answer 5 · 2026-04-10 19:01:38

129

Views

What terms can I use for a shape close to a circle but shaped like amoeba?

Published on 10 Apr 2026 - 19:01

score 140 · Answer 6 · 2026-04-15 10:12:09

140

Views

Interpolation of $\Pi_\Sigma(N)$

Published on 15 Apr 2026 - 10:12

score 157 · Answer 7 · 2026-04-14 00:31:14

157

Views

Find the number of unbeatable integers between $256$ and $1024$ inclusive

Published on 14 Apr 2026 - 0:31

score 77 · Answer 8 · 2026-04-14 08:30:30

77

Views

Would it be possible to create a Lucas-Lehmer-like test for primes of the form$ 3^{n}-2$

Published on 14 Apr 2026 - 8:30

score 78 · Answer 9 · 2026-04-12 22:10:12

78

Views

Strange parking problem on my street - looking to solve for the probability spots are effectively filled

Published on 12 Apr 2026 - 22:10

score 490 · Answer 10 · 2026-04-13 17:53:28

490

Views

How many numbers are there such that its number of decimal digits equals to the number of its distinct prime factors?

Published on 13 Apr 2026 - 17:53

score 59 · Answer 11 · 2026-04-14 04:18:08

59

Views

How to reduce differential operator to a 4th order ODE of the standard Euler type?

Published on 14 Apr 2026 - 4:18

score 67 · Answer 12 · 2026-04-14 05:49:49

67

Views

How can we count the number of combinations without casework in this problem?

Published on 14 Apr 2026 - 5:49

score 736 · Answer 13 · 2026-04-25 03:04:20

736

Views

What is the maximum "alive density" of cells in Conway's Game of Life when played on a torus?

Published on 25 Apr 2026 - 3:04

score 496 · Answer 14 · 2026-04-16 04:44:13

496

Views

Classifying all numbers $n$ with the property that if $p$ is a prime, then $p \mid n \iff p-1 \mid n$

Published on 16 Apr 2026 - 4:44

score 375 · Answer 15 · 2026-04-12 06:56:03

375

Views

Is $404$ a palindrome in base negative $31$?

Published on 12 Apr 2026 - 6:56

List Question

Permutations of a $4\times4$ grid generated by permutations of rows, columns, and $2\times2$ quadrants

Creating p-interesting graphs

Interesting find in integrating $f(\text{x})=e^{i \pi x} \left(1-(x+1)^{\frac{1}{x+1}}\right).$ Why?

$\sum_{d|n} \phi (\tau (d))=?$

What terms can I use for a shape close to a circle but shaped like amoeba?

Interpolation of $\Pi_\Sigma(N)$

Find the number of unbeatable integers between $256$ and $1024$ inclusive

Would it be possible to create a Lucas-Lehmer-like test for primes of the form$ 3^{n}-2$

Strange parking problem on my street - looking to solve for the probability spots are effectively filled

How many numbers are there such that its number of decimal digits equals to the number of its distinct prime factors?

How to reduce differential operator to a 4th order ODE of the standard Euler type?

How can we count the number of combinations without casework in this problem?

What is the maximum "alive density" of cells in Conway's Game of Life when played on a torus?

Classifying all numbers $n$ with the property that if $p$ is a prime, then $p \mid n \iff p-1 \mid n$

Is $404$ a palindrome in base negative $31$?

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