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