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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
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
triangles
differentiation
doubling
angles
digits
logic
regular shapes
wordplay
probability
tournaments
calculus
surds
even numbers
mean
pentagons
triangle numbers
sport
multiplication
volume
remainders
geometric mean
factorials
hexagons
irreducible numbers
pascal's triangle
time
coordinates
coins
integers
speed
indices
decahedra
spheres
determinants
the only crossnumber
polygons
games
matrices
addition
balancing
2d shapes
lines
cryptic clues
money
sum to infinity
probabilty
palindromes
binary
cubics
percentages
gerrymandering
floors
rectangles
multiples
taxicab geometry
combinatorics
crosswords
rugby
dominos
number
dodecagons
digital clocks
algebra
colouring
graphs
bases
albgebra
perimeter
tiling
dice
quadrilaterals
3d shapes
planes
odd numbers
square numbers
crossnumbers
star numbers
books
factors
square roots
quadratics
proportion
squares
chocolate
people maths
advent
dates
consecutive numbers
area
elections
median
scales
geometry
trigonometry
cards
menace
parabolas
unit fractions
complex numbers
fractions
prime numbers
christmas
division
tangents
digital products
sets
chalkdust crossnumber
averages
circles
symmetry
cryptic crossnumbers
integration
ave
grids
shape
geometric means
functions
axes
cube numbers
expansions
sequences
arrows
crossnumber
partitions
products
folding tube maps
consecutive integers
sums
shapes
numbers
chess
ellipses
polynomials
clocks
means
range
routes
perfect numbers
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