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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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▼ show ▼
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Most recent collections
Advent calendar 2020
Advent calendar 2019
Sunday Afternoon Maths LXVII
Coloured weights
Not Roman numerals
Advent calendar 2018
List of all puzzles
Tags
rectangles
quadratics
polygons
division
cryptic crossnumbers
sums
chalkdust crossnumber
algebra
irreducible numbers
crosswords
multiplication
grids
advent
books
angles
2d shapes
pascal's triangle
volume
dodecagons
planes
differentiation
perfect numbers
rugby
partitions
dates
functions
area
numbers
symmetry
cards
probability
mean
logic
complex numbers
quadrilaterals
tiling
shape
speed
prime numbers
number
dice
indices
colouring
cube numbers
fractions
digital clocks
money
christmas
the only crossnumber
doubling
games
range
addition
trigonometry
sum to infinity
factors
routes
wordplay
integers
arrows
elections
cryptic clues
integration
3d shapes
remainders
averages
digits
people maths
bases
geometry
squares
parabolas
ellipses
multiples
probabilty
clocks
dominos
products
surds
ave
square roots
median
spheres
menace
coins
scales
circles
calculus
proportion
floors
hexagons
crossnumber
taxicab geometry
sport
lines
coordinates
odd numbers
perimeter
chess
balancing
crossnumbers
sequences
means
regular shapes
triangles
percentages
palindromes
folding tube maps
triangle numbers
square numbers
gerrymandering
unit fractions
time
graphs
combinatorics
factorials
shapes
chocolate
star numbers
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