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