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