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Advent calendar 2015
22 December
All 2015 advent puzzles
~
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What is the largest number which cannot be written as the sum of distinct squares?
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128
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numbers
,
square numbers
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cryptic crossnumbers
numbers
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hexagons
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integers
scales
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chalkdust crossnumber
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time
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dominos
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rugby
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sum to infinity
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ave
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cube numbers
xor
addition
cryptic clues
shape
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irreducible numbers
tiling
grids
volume
differentiation
chocolate
balancing
algebra
geometric mean
pascal's triangle
unit fractions
the only crossnumber
menace
combinatorics
neighbours
elections
quadrilaterals
multiples
percentages
christmas
floors
quadratics
books
binary
sets
ellipses
dates
rectangles
2d shapes
circles
people maths
tournaments
colouring
calculus
medians
probabilty
doubling
even numbers
crosswords
taxicab geometry
complex numbers
indices
gerrymandering
partitions
factorials
multiplaction squares
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
circles
crosswords
money
expansions
factors
area
wordplay
sets
neighbours
multiplication
advent
ave
algebra
xor
scales
perimeter
quadrilaterals
range
shapes
means
tangents
spheres
geometric means
shape
the only crossnumber
sport
2d shapes
odd numbers
digits
addition
elections
coordinates
square roots
decahedra
floors
factorials
folding tube maps
partitions
chess
prime numbers
powers
even numbers
geometry
tournaments
dates
pentagons
trigonometry
functions
grids
median
dice
digital clocks
bases
palindromes
differentiation
binary
products
people maths
probability
number
division
consecutive integers
calculus
sums
triangles
lists
games
sum to infinity
symmetry
cards
planes
regular shapes
albgebra
angles
integration
multiples
rectangles
proportion
irreducible numbers
crossnumbers
square grids
polygons
books
dominos
geometric mean
combinatorics
fractions
colouring
unit fractions
gerrymandering
logic
squares
cryptic clues
mean
percentages
surds
chalkdust crossnumber
prime factors
axes
numbers
consecutive numbers
doubling
christmas
square numbers
tiling
routes
polynomials
star numbers
volume
averages
3d shapes
coins
balancing
hexagons
taxicab geometry
pascal's triangle
cryptic crossnumbers
time
ellipses
triangle numbers
medians
matrices
indices
speed
remainders
probabilty
multiplaction squares
dodecagons
sequences
quadratics
graphs
lines
determinants
parabolas
perfect numbers
clocks
digital products
complex numbers
rugby
menace
arrows
cube numbers
cubics
chocolate
integers
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