# Puzzles

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

symmetry cards area partitions arrows logic coordinates pascal's triangle sport multiplication odd numbers polygons square roots complex numbers shapes rectangles remainders crossnumbers prime numbers rugby sequences triangle numbers christmas factors digits clocks colouring sum to infinity number circles graphs routes division folding tube maps cryptic clues speed integers indices surds differentiation planes shape averages books dates crosswords advent chess taxicab geometry percentages doubling people maths balancing numbers algebra probabilty dice functions proportion floors angles coins menace sums squares quadratics money factorials bases games dodecagons 2d shapes ellipses irreducible numbers perfect numbers scales geometry chalkdust crossnumber perimeter square numbers cryptic crossnumbers volume hexagons unit fractions palindromes means time cube numbers chocolate wordplay triangles parabolas integration calculus spheres regular shapes ave addition trigonometry probability multiples fractions mean 3d shapes grids star numbers lines## 22 December

Today's number is a palindrome. Today's number is also the number of palindromes between 111 and 11111 (including 111 and 11111).

## 14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?