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