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