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Advent calendar 2018
20 December
All 2018 advent puzzles
~
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Today's number is the sum of all the numbers less than 40 that are not factors of 40.
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730
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numbers
,
factors
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floors
dates
tiling
differentiation
coins
cryptic clues
digital products
fractions
pentagons
decahedra
consecutive numbers
gerrymandering
bases
quadratics
lists
digits
3d shapes
the only crossnumber
shape
integration
advent
number
products
menace
star numbers
logic
powers
prime factors
cube numbers
parabolas
people maths
averages
books
geometric mean
arrows
scales
grids
trigonometry
combinatorics
square numbers
multiplaction squares
calculus
digital clocks
sport
dice
square roots
integers
crossnumbers
consecutive integers
dominos
chess
functions
xor
symmetry
binary
speed
time
ellipses
dodecagons
lines
2d shapes
complex numbers
routes
matrices
sets
elections
odd numbers
means
rugby
christmas
even numbers
wordplay
chalkdust crossnumber
division
factors
cards
triangle numbers
triangles
planes
prime numbers
multiplication
indices
probability
spheres
polynomials
square grids
geometry
expansions
angles
ave
medians
area
perfect numbers
rectangles
graphs
tangents
polygons
partitions
balancing
colouring
hexagons
quadrilaterals
chocolate
money
palindromes
numbers
probabilty
factorials
coordinates
volume
determinants
squares
multiples
pascal's triangle
mean
sum to infinity
games
shapes
unit fractions
range
sequences
percentages
taxicab geometry
surds
irreducible numbers
cryptic crossnumbers
geometric means
crosswords
folding tube maps
axes
doubling
addition
clocks
regular shapes
proportion
remainders
algebra
sums
neighbours
cubics
tournaments
perimeter
median
albgebra
circles
Archive
Show me a random puzzle
▼ show ▼
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
taxicab geometry
doubling
percentages
polynomials
speed
quadrilaterals
chess
square grids
crossnumbers
decahedra
palindromes
ave
regular shapes
cube numbers
rectangles
prime numbers
division
grids
tournaments
christmas
bases
numbers
angles
digits
axes
floors
trigonometry
advent
balancing
people maths
prime factors
digital products
even numbers
geometric means
scales
partitions
star numbers
time
perfect numbers
unit fractions
fractions
sets
dates
dice
multiples
books
planes
crosswords
lists
money
consecutive numbers
functions
polygons
combinatorics
remainders
elections
games
determinants
lines
sport
clocks
cards
pentagons
2d shapes
wordplay
probability
tiling
binary
surds
volume
cryptic crossnumbers
cubics
routes
area
square numbers
folding tube maps
square roots
coins
shape
geometric mean
mean
sequences
3d shapes
spheres
perimeter
neighbours
calculus
probabilty
logic
chocolate
addition
arrows
ellipses
algebra
irreducible numbers
sum to infinity
chalkdust crossnumber
factors
consecutive integers
rugby
range
geometry
odd numbers
quadratics
integers
expansions
multiplication
circles
means
xor
shapes
indices
products
parabolas
graphs
hexagons
multiplaction squares
median
matrices
factorials
triangle numbers
averages
colouring
dominos
powers
dodecagons
number
differentiation
triangles
proportion
medians
menace
cryptic clues
sums
squares
pascal's triangle
albgebra
tangents
digital clocks
the only crossnumber
gerrymandering
coordinates
complex numbers
integration
symmetry
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