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