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Advent calendar 2017
21 December
All 2017 advent puzzles
~
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The factors of 6 (excluding 6 itself) are 1, 2 and 3. \(1+2+3=6\), so 6 is a
perfect number
.
Today's number is the only three digit perfect number.
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496
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numbers
,
factors
,
perfect numbers
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money
consecutive integers
calculus
partitions
time
triangles
integers
expansions
spheres
squares
dice
determinants
axes
routes
planes
geometric mean
circles
symmetry
area
functions
digital products
percentages
geometry
median
multiples
colouring
star numbers
square numbers
remainders
shape
complex numbers
advent
logic
clocks
folding tube maps
pascal's triangle
grids
the only crossnumber
probabilty
multiplication
cryptic crossnumbers
multiplaction squares
hexagons
books
christmas
scales
chocolate
indices
neighbours
speed
square grids
square roots
pentagons
perimeter
trigonometry
sets
surds
probability
combinatorics
cubics
xor
sequences
prime factors
ellipses
matrices
dominos
mean
numbers
lists
range
division
elections
floors
palindromes
addition
products
binary
even numbers
integration
proportion
taxicab geometry
triangle numbers
3d shapes
albgebra
crossnumbers
gerrymandering
factors
coins
odd numbers
digital clocks
chalkdust crossnumber
chess
dodecagons
unit fractions
crosswords
digits
cube numbers
cards
volume
wordplay
balancing
2d shapes
number
fractions
medians
regular shapes
tangents
differentiation
coordinates
perfect numbers
sport
games
people maths
powers
parabolas
lines
prime numbers
sums
rugby
geometric means
graphs
algebra
means
tiling
quadratics
quadrilaterals
sum to infinity
menace
consecutive numbers
averages
bases
polygons
tournaments
rectangles
factorials
arrows
shapes
dates
irreducible numbers
angles
decahedra
polynomials
ave
doubling
cryptic clues
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