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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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sum to infinity
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cryptic clues
folding tube maps
indices
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triangle numbers
algebra
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speed
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irreducible numbers
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dominos
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binary
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people maths
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2d shapes
ave
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axes
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hexagons
fractions
angles
star numbers
taxicab geometry
factorials
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doubling
cards
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albgebra
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tiling
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grids
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square numbers
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
sequences
grids
regular shapes
odd numbers
bases
surds
elections
unit fractions
fractions
square grids
balancing
factors
christmas
even numbers
pentagons
cubics
gerrymandering
numbers grids
squares
folding tube maps
addition
integration
geometric mean
lines
binary
crossnumbers
range
trigonometry
tiling
wordplay
probability
division
number
parabolas
rectangles
square roots
multiples
expansions
differentiation
irreducible numbers
triangle numbers
sums
combinatorics
ave
taxicab geometry
logic
speed
floors
games
geometric means
perimeter
chess
mean
geometry
crossnumber
dodecagons
sport
polygons
shapes
coordinates
dominos
matrices
proportion
perfect numbers
digits
albgebra
symmetry
percentages
area
triangles
chocolate
probabilty
planes
angles
3d shapes
2d shapes
polynomials
integers
the only crossnumber
money
square numbers
determinants
cryptic clues
scales
coins
hexagons
pascal's triangle
arrows
tangents
algebra
menace
time
star numbers
consecutive numbers
cards
neighbours
tournaments
dice
sum to infinity
indices
routes
quadrilaterals
graphs
averages
palindromes
partitions
volume
decahedra
digital products
multiplication
circles
medians
prime numbers
advent
cube numbers
doubling
remainders
functions
crosswords
means
consecutive integers
factorials
cryptic crossnumbers
rugby
axes
products
chalkdust crossnumber
books
dates
digital clocks
spheres
complex numbers
calculus
sets
colouring
numbers
powers
shape
median
ellipses
quadratics
people maths
clocks
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