# Advent calendar 2018

## 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

circles number spheres probabilty dodecagons numbers digits partitions perfect numbers sport chocolate rectangles squares lines taxicab geometry crossnumbers folding tube maps angles triangles quadratics symmetry integers remainders cryptic crossnumbers addition parabolas complex numbers rugby time proportion pascal's triangle people maths cryptic clues doubling fractions bases sequences coins clocks hexagons regular shapes algebra unit fractions integration multiples grids odd numbers irreducible numbers advent 3d shapes factors scales logic cube numbers routes trigonometry probability square roots triangle numbers coordinates money planes christmas star numbers wordplay averages chess menace division palindromes colouring differentiation cards functions multiplication crosswords chalkdust crossnumber calculus ellipses sums speed ave games sum to infinity shape 2d shapes polygons square numbers graphs volume means mean surds geometry shapes balancing perimeter prime numbers area floors dice dates books arrows indices factorials percentages## 24 December

1,0,2,0,1,1

The sequence of six numbers above has two properties:

- Each number is either 0, 1 or 2.
- Each pair of consecutive numbers adds to (strictly) less than 3.

Today's number is the number of sequences of six numbers with these two properties