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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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the only crossnumber
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chalkdust crossnumber
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shapes
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number
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2d shapes
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cryptic crossnumbers
fractions
polygons
consecutive numbers
quadrilaterals
determinants
quadratics
expansions
combinatorics
dice
hexagons
prime factors
trigonometry
area
probabilty
odd numbers
polynomials
digital products
range
scales
sum to infinity
symmetry
parabolas
percentages
regular shapes
means
sets
multiples
angles
planes
elections
geometric mean
differentiation
christmas
wordplay
perimeter
factorials
people maths
integration
graphs
games
products
axes
binary
surds
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dodecagons
volume
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multiplaction squares
xor
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