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196 Questions

Views Newest Activity Votes

votes

answer

133

views

Ewan, Ries, and Avut

Sep 23 at 15:12 msh210 2,884

votes

answers

views

Spider and fly on a cube

mathematics geometry game

Jan 11 '19 at 18:12 Richard Bennett 21

votes

answers

420

views

How to beat Count Dracula, part 3

mathematics strategy probability game

May 30 '16 at 13:34 Community♦ 1

votes

answers

356

views

How to beat Count Dracula, part 2

mathematics strategy probability game

May 28 '16 at 13:29 Community♦ 1

votes

answer

views

Professor Halfbrain and the sum of the digits of all divisors

mathematics number-sequence number-theory reachability

May 25 '16 at 22:15 hexomino 73.8k

votes

answers

views

Uphill and downhill [closed]

mathematics calculation-puzzle

May 22 '16 at 12:24 Community♦ 1

votes

answers

views

A search game with 2016 numbers

mathematics strategy game

May 17 '16 at 16:33 ghosts_in_the_code 6,707

votes

answer

630

views

A table filled with greatest common divisors

mathematics number-theory

May 12 '16 at 12:14 2012rcampion 13k

votes

answers

views

Red cells in a 2016x2016 table

mathematics combinatorics

Apr 16 '16 at 16:29 Community♦ 1

votes

answer

views

Red cells in a 4x4 table

mathematics combinatorics

Apr 14 '16 at 10:22 Fabich 7,057

votes

answers

views

Professor Halfbrain and numbers with many zeros

mathematics number-theory

Apr 13 '16 at 11:48 kasperd 1,247

votes

answers

457

views

Yet another adventitious triangle

mathematics geometry

Apr 11 '16 at 19:39 Community♦ 1

votes

answers

418

views

Red, blue and yellow points

mathematics geometry

Apr 13 '16 at 17:07 Michael Seifert 1,365

votes

answer

views

A game with 330 pebbles

mathematics strategy combinatorics game

Apr 6 '16 at 11:17 manshu 6,134

votes

answers

569

views

Please make x and y and z

mathematics formation-of-numbers

Apr 2 '16 at 6:16 Community♦ 1

votes

answers

views

A ship departs from Le Havre

mathematics calculation-puzzle puzzle-history

Apr 1 '16 at 16:12 Knight0fDragon 131

votes

answer

530

views

A magical ordering of the positive integers

mathematics combinatorics number-theory

Mar 30 '16 at 18:17 Nautilus 4,413

votes

answers

684

views

A matchstick game

mathematics strategy game matches

Mar 28 '16 at 0:18 ffao 20.8k

votes

answer

214

views

Professor Halfbrain and the wonderful rectangles

geometry combinatorics dissection tiling

Mar 26 '16 at 23:11 f'' 31.8k

votes

answer

393

views

The adventitious 18-gon

mathematics geometry algebra

Mar 25 '16 at 19:44 Community♦ 1

votes

answers

410

views

Removing green marbles from the table

mathematics strategy game nim

Mar 25 '16 at 14:56 Dragonemperor42 1,950

votes

answers

279

views

Professor Halfbrain and the tennis club

mathematics combinatorics graph-theory

Mar 25 '16 at 19:21 Nautilus 4,413

votes

answers

719

views

A triangular Quidditch field

mathematics geometry

Mar 25 '16 at 10:19 Community♦ 1

votes

answers

369

views

Four indeed is cosmic!

mathematics number-sequence reachability

Mar 22 '16 at 18:13 Community♦ 1

votes

answers

views

A man bought several liters of wine

mathematics algebra puzzle-history

Aug 15 '17 at 14:58 Gamow 43.2k

votes

answers

views

Toy boat on a string

mathematics

Mar 18 '16 at 17:42 Oray 26.1k

votes

answer

820

views

The second frog concerto

mathematics combinatorics

Mar 18 '16 at 9:08 Community♦ 1

votes

answers

views

A breathtaking way of making every possible positive integer

mathematics formation-of-numbers

Feb 26 '18 at 12:57 jlc 1

votes

answers

views

The frog concerto

mathematics combinatorics

Mar 16 '16 at 23:11 Paul Sinclair 1,146

votes

answers

879

views

Professor Halfbrain and the powers of 2016

mathematics number-theory

Mar 22 '16 at 4:07 Community♦ 1

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196 Questions

Ewan, Ries, and Avut

Spider and fly on a cube

How to beat Count Dracula, part 3

How to beat Count Dracula, part 2

Professor Halfbrain and the sum of the digits of all divisors

Uphill and downhill [closed]

A search game with 2016 numbers

A table filled with greatest common divisors

Red cells in a 2016x2016 table

Red cells in a 4x4 table

Professor Halfbrain and numbers with many zeros

Yet another adventitious triangle

Red, blue and yellow points

A game with 330 pebbles

Please make x and y and z

A ship departs from Le Havre

A magical ordering of the positive integers

A matchstick game

Professor Halfbrain and the wonderful rectangles

The adventitious 18-gon

Removing green marbles from the table

Professor Halfbrain and the tennis club

A triangular Quidditch field

Four indeed is cosmic!

A man bought several liters of wine

Toy boat on a string

The second frog concerto

A breathtaking way of making every possible positive integer

The frog concerto

Professor Halfbrain and the powers of 2016