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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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axes
folding tube maps
digits
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mean
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area
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sums
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multiplication
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spheres
partitions
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odd numbers
grids
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dates
ave
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christmas
menace
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doubling
range
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number
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dice
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chalkdust crossnumber
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cryptic crossnumbers
sets
sum to infinity
planes
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time
star numbers
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wordplay
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squares
dominos
speed
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even numbers
gerrymandering
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people maths
percentages
elections
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prime numbers
pascal's triangle
geometric means
cryptic clues
symmetry
the only crossnumber
perimeter
tiling
coordinates
books
surds
indices
consecutive numbers
logic
parabolas
tournaments
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factors
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probability
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lines
numbers
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consecutive integers
bases
volume
hexagons
advent
geometry
algebra
coins
crossnumbers
perfect numbers
median
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polynomials
unit fractions
triangles
regular shapes
tangents
means
complex numbers
dodecagons
integers
determinants
chocolate
Archive
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
axes
multiplication
dates
integers
rectangles
symmetry
determinants
coordinates
odd numbers
factorials
balancing
expansions
speed
proportion
clocks
colouring
indices
sum to infinity
matrices
palindromes
differentiation
mean
spheres
quadratics
logic
gerrymandering
circles
squares
rugby
cube numbers
digital clocks
parabolas
christmas
pentagons
volume
dodecagons
products
multiples
taxicab geometry
numbers
menace
pascal's triangle
albgebra
angles
grids
books
percentages
triangles
elections
crosswords
prime numbers
scales
shape
shapes
sequences
doubling
trigonometry
area
money
lines
cryptic crossnumbers
partitions
dice
graphs
routes
folding tube maps
planes
probabilty
unit fractions
quadrilaterals
polynomials
the only crossnumber
sport
triangle numbers
digital products
wordplay
geometric means
cryptic clues
means
even numbers
factors
irreducible numbers
perimeter
digits
chocolate
complex numbers
bases
chalkdust crossnumber
square roots
tangents
remainders
games
sets
floors
consecutive numbers
star numbers
perfect numbers
decahedra
fractions
square numbers
coins
polygons
geometric mean
chess
ave
calculus
number
consecutive integers
median
geometry
surds
tiling
crossnumber
advent
regular shapes
algebra
integration
dominos
3d shapes
sums
hexagons
cards
addition
people maths
combinatorics
crossnumbers
tournaments
cubics
arrows
2d shapes
ellipses
functions
time
range
binary
probability
division
averages
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