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