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