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Advent calendar 2015
8 December
All 2015 advent puzzles
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What is the largest number of factors which a number less than a million has?
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720720 has 240 factors.
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Most recent collections
Advent calendar 2019
Sunday Afternoon Maths LXVII
Coloured weights
Not Roman numerals
Advent calendar 2018
Sunday Afternoon Maths LXVI
Cryptic crossnumber #2
List of all puzzles
Tags
angles
probability
2d shapes
scales
triangle numbers
speed
dodecagons
probabilty
mean
menace
doubling
tiling
3d shapes
factors
functions
money
number
symmetry
chess
area
gerrymandering
percentages
cards
spheres
cryptic clues
grids
digital clocks
unit fractions
geometry
odd numbers
polygons
products
factorials
rectangles
integers
algebra
sums
cryptic crossnumbers
ellipses
palindromes
averages
addition
advent
square roots
floors
people maths
digits
games
parabolas
taxicab geometry
sport
prime numbers
differentiation
shapes
dice
ave
proportion
planes
dates
hexagons
wordplay
square numbers
bases
fractions
multiples
the only crossnumber
indices
crosswords
balancing
colouring
elections
coins
surds
volume
sum to infinity
quadratics
median
pascal's triangle
partitions
remainders
christmas
rugby
crossnumbers
perimeter
numbers
star numbers
sequences
means
routes
calculus
range
arrows
clocks
complex numbers
shape
regular shapes
dominos
division
folding tube maps
triangles
chalkdust crossnumber
logic
lines
time
squares
integration
cube numbers
circles
irreducible numbers
multiplication
crossnumber
perfect numbers
chocolate
graphs
trigonometry
coordinates
books
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