User Bernardo Recamán Santos

7 votes

2 answers

1k views

Primes and Squares

asked Nov 26, 2018 at 14:59

7 votes

2 answers

838 views

Numbered Billiard Balls

asked Nov 20, 2018 at 1:59

7 votes

3 answers

1k views

Avoiding arithmetic progressions in square grids

asked Aug 10, 2022 at 14:43

7 votes

2 answers

1k views

My library membership number

asked Oct 21, 2022 at 13:47

7 votes

2 answers

1k views

The Birthday Paradox, revisited

asked Nov 11, 2022 at 14:33

7 votes

1 answer

1k views

Find the carpets

asked Nov 17, 2022 at 1:18

7 votes

1 answer

225 views

Prime Boggle Game

asked Sep 14, 2023 at 2:02

7 votes

1 answer

355 views

An Irregular Colombian Sudoku

asked Feb 23 at 16:39

7 votes

1 answer

186 views

A pandigital alphametic

asked Apr 13 at 14:19

7 votes

2 answers

1k views

A Difficult Colombian Sudoku?

asked Apr 18 at 17:24

6 votes

2 answers

242 views

Very Kind Neighbors

asked Mar 27 at 16:04

6 votes

4 answers

2k views

A Prime Ant's Excursion in the Cartesian Plane

asked Nov 15, 2023 at 19:29

6 votes

2 answers

351 views

While 2024 arrives

asked Dec 22, 2023 at 17:02

6 votes

1 answer

331 views

Sudokus with no 3-term arithmetic progressions within

asked Jan 4 at 14:09

6 votes

2 answers

1k views

499 and the Gamma Function

asked Mar 25, 2023 at 12:08

6 votes

1 answer

260 views

Self-numbers and repunits

asked May 30, 2023 at 19:10

6 votes

3 answers

1k views

More Genuine and Fake Coins

asked Oct 11, 2022 at 1:13

6 votes

2 answers

886 views

Splitting the integers 1 to 36

asked Apr 28, 2022 at 21:13

6 votes

2 answers

1k views

The Magic Letter H

asked Nov 22, 2018 at 17:08

6 votes

2 answers

1k views

A partition of 80 into seven parts

asked Dec 1, 2018 at 16:20

6 votes

2 answers

3k views

Expressing numbers using 0, 1, 2, 3, and 4

asked Aug 9, 2016 at 13:06

6 votes

2 answers

1k views

Primes in a Line

asked May 14, 2020 at 17:18

5 votes

2 answers

1k views

Consecutive numbers which use all digits a different number of times

asked Apr 30, 2020 at 4:27

5 votes

1 answer

1k views

Playing Collatz with graphs

asked Feb 21, 2020 at 20:26

5 votes

2 answers

1k views

Paying bills in Alphagonia

asked Nov 7, 2020 at 13:53

5 votes

2 answers

213 views

Consecutive numbers whose digital sum in base 10 is the same as in base 2

asked Nov 11, 2020 at 15:34

5 votes

3 answers

1k views

Numbers which use three times as many digits in base 2 as in base 10

asked Nov 11, 2020 at 22:46

5 votes

2 answers

1k views

Swapping the first and last digits of an integer

asked Jun 19, 2020 at 15:58

5 votes

1 answer

838 views

My High School's Reunion

asked Sep 28, 2021 at 20:51

5 votes

2 answers

1k views

The Game of MIM

asked Nov 5, 2021 at 0:47

Stack Exchange Network

209 Questions

Primes and Squares

Numbered Billiard Balls

Avoiding arithmetic progressions in square grids

My library membership number

The Birthday Paradox, revisited

Find the carpets

Prime Boggle Game

An Irregular Colombian Sudoku

A pandigital alphametic

A Difficult Colombian Sudoku?

Very Kind Neighbors

A Prime Ant's Excursion in the Cartesian Plane

While 2024 arrives

Sudokus with no 3-term arithmetic progressions within

499 and the Gamma Function

Self-numbers and repunits

More Genuine and Fake Coins

Splitting the integers 1 to 36

The Magic Letter H

A partition of 80 into seven parts

Expressing numbers using 0, 1, 2, 3, and 4

Primes in a Line

Consecutive numbers which use all digits a different number of times

Playing Collatz with graphs

Paying bills in Alphagonia

Consecutive numbers whose digital sum in base 10 is the same as in base 2

Numbers which use three times as many digits in base 2 as in base 10

Swapping the first and last digits of an integer

My High School's Reunion

The Game of MIM