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