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