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