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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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even numbers
lines
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logic
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proportion
angles
functions
factorials
powers
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crosswords
combinatorics
area
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menace
prime numbers
rectangles
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square numbers
square grids
floors
multiplication
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calculus
sum to infinity
cryptic clues
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prime factors
odd numbers
crossnumbers
addition
cryptic crossnumbers
christmas
parabolas
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geometric means
books
integration
doubling
shapes
squares
binary
perfect numbers
triangle numbers
tiling
elections
quadrilaterals
irreducible numbers
hexagons
routes
ave
determinants
scales
complex numbers
pascal's triangle
geometric mean
partitions
symmetry
coins
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clocks
wordplay
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gerrymandering
factors
digital products
cube numbers
number
consecutive integers
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xor
dates
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mean
star numbers
unit fractions
shape
colouring
money
albgebra
products
median
remainders
matrices
trigonometry
rugby
tournaments
multiplaction squares
time
sets
spheres
arrows
taxicab geometry
expansions
decahedra
multiples
polygons
digits
indices
division
volume
chalkdust crossnumber
triangles
polynomials
pentagons
quadratics
range
probabilty
square roots
folding tube maps
regular shapes
people maths
advent
algebra
consecutive numbers
numbers
lists
geometry
bases
differentiation
surds
balancing
means
neighbours
speed
axes
integers
dice
cubics
chocolate
3d shapes
averages
the only crossnumber
dodecagons
perimeter
sequences
percentages
graphs
palindromes
tangents
chess
ellipses
Archive
Show me a random puzzle
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
pascal's triangle
products
books
percentages
cubics
crossnumbers
square numbers
money
factorials
cryptic crossnumbers
lists
algebra
tournaments
xor
proportion
division
surds
volume
irreducible numbers
parabolas
elections
square roots
circles
spheres
triangle numbers
factors
2d shapes
doubling
addition
folding tube maps
averages
wordplay
shape
digital products
functions
means
hexagons
time
fractions
crosswords
medians
shapes
palindromes
the only crossnumber
chocolate
axes
median
sums
numbers
pentagons
floors
angles
probabilty
perfect numbers
trigonometry
determinants
symmetry
sets
sport
partitions
integration
dodecagons
squares
decahedra
cube numbers
planes
ave
area
balancing
chess
neighbours
arrows
calculus
regular shapes
tiling
geometric mean
quadratics
cryptic clues
christmas
geometric means
number
dominos
prime factors
star numbers
lines
combinatorics
dates
square grids
multiples
tangents
mean
integers
graphs
quadrilaterals
differentiation
complex numbers
remainders
indices
geometry
unit fractions
taxicab geometry
expansions
ellipses
perimeter
range
people maths
digits
sequences
routes
probability
polynomials
digital clocks
bases
grids
games
odd numbers
cards
3d shapes
matrices
dice
advent
rectangles
albgebra
chalkdust crossnumber
coordinates
coins
multiplaction squares
consecutive numbers
consecutive integers
prime numbers
rugby
clocks
logic
multiplication
speed
binary
powers
scales
menace
gerrymandering
triangles
even numbers
sum to infinity
colouring
polygons
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