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