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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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the only crossnumber
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ave
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christmas
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folding tube maps
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
dominos
3d shapes
games
numbers
squares
time
functions
irreducible numbers
balancing
combinatorics
palindromes
matrices
graphs
speed
doubling
colouring
cards
probability
differentiation
advent
dodecagons
decahedra
angles
books
elections
range
clocks
odd numbers
chocolate
medians
logic
arrows
surds
polynomials
parabolas
quadrilaterals
folding tube maps
cube numbers
probabilty
partitions
polygons
tangents
2d shapes
grids
geometric mean
factors
circles
triangle numbers
crosswords
addition
rectangles
area
planes
star numbers
geometry
hexagons
sums
binary
chalkdust crossnumber
routes
indices
pascal's triangle
powers
coordinates
perfect numbers
pentagons
digits
taxicab geometry
tiling
chess
remainders
multiples
sets
integers
rugby
menace
fractions
quadratics
sum to infinity
trigonometry
gerrymandering
determinants
ave
people maths
dates
cryptic crossnumbers
averages
shape
christmas
consecutive integers
multiplication
numbers grids
sequences
the only crossnumber
digital clocks
spheres
wordplay
axes
digital products
albgebra
expansions
geometric means
prime numbers
integration
floors
mean
cubics
volume
products
coins
unit fractions
median
neighbours
square roots
perimeter
square numbers
calculus
dice
money
cryptic clues
consecutive numbers
regular shapes
sport
bases
algebra
factorials
symmetry
ellipses
complex numbers
division
crossnumbers
number
triangles
shapes
means
square grids
proportion
scales
even numbers
tournaments
lines
percentages
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