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Advent calendar 2017
14 December
All 2017 advent puzzles
~
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There are
204 squares (of any size) in an 8×8 grid of squares
. Today's number is the number of squares in a 13×13 grid of squares
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819
Tags:
square numbers
,
squares
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prime factors
advent
taxicab geometry
dates
probabilty
books
coordinates
christmas
scales
shape
sequences
2d shapes
cryptic crossnumbers
elections
powers
cards
odd numbers
doubling
neighbours
square numbers
indices
unit fractions
time
square roots
3d shapes
binary
calculus
hexagons
tournaments
integers
even numbers
games
factorials
graphs
perfect numbers
wordplay
geometry
numbers
fractions
sport
complex numbers
surds
consecutive integers
logic
prime numbers
multiplication
triangle numbers
parabolas
chess
averages
multiples
arrows
triangles
shapes
pascal's triangle
proportion
bases
sum to infinity
cryptic clues
expansions
chalkdust crossnumber
palindromes
speed
perimeter
clocks
number
sums
addition
means
dodecagons
symmetry
remainders
folding tube maps
geometric means
polynomials
rugby
dominos
colouring
trigonometry
angles
quadrilaterals
balancing
tangents
chocolate
determinants
ave
differentiation
xor
probability
the only crossnumber
products
ellipses
albgebra
grids
irreducible numbers
dice
circles
regular shapes
digits
routes
floors
cube numbers
rectangles
cubics
axes
percentages
medians
area
range
spheres
lists
division
star numbers
planes
tiling
functions
crossnumbers
coins
decahedra
gerrymandering
sets
geometric mean
polygons
people maths
digital clocks
money
square grids
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pentagons
algebra
digital products
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mean
quadratics
volume
crosswords
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