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