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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
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perfect numbers
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Archive
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▼ show ▼
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
geometry
sums
albgebra
volume
combinatorics
geometric mean
cube numbers
sets
christmas
remainders
grids
consecutive integers
proportion
averages
cryptic clues
polygons
logic
triangle numbers
pentagons
perfect numbers
fractions
multiplication
3d shapes
square roots
sum to infinity
clocks
division
dodecagons
squares
digital products
cryptic crossnumbers
doubling
digits
unit fractions
even numbers
spheres
chess
matrices
integers
time
elections
quadrilaterals
dice
chalkdust crossnumber
binary
cubics
wordplay
consecutive numbers
symmetry
calculus
percentages
pascal's triangle
expansions
area
numbers
cards
people maths
polynomials
integration
trigonometry
books
odd numbers
colouring
rectangles
shape
2d shapes
functions
regular shapes
complex numbers
games
prime numbers
folding tube maps
quadratics
irreducible numbers
palindromes
range
taxicab geometry
products
dominos
dates
bases
ellipses
number
median
planes
coordinates
sport
shapes
probability
floors
factors
gerrymandering
coins
digital clocks
crossnumbers
triangles
crosswords
speed
perimeter
routes
angles
star numbers
the only crossnumber
algebra
graphs
square numbers
tangents
tiling
crossnumber
mean
geometric means
sequences
lines
means
addition
circles
scales
menace
axes
surds
probabilty
differentiation
determinants
ave
hexagons
factorials
chocolate
partitions
parabolas
advent
tournaments
decahedra
arrows
indices
rugby
balancing
multiples
money
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