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Advent calendar 2019
24 December
All 2019 advent puzzles
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There are six 3-digit numbers with the property that the sum of their digits is equal to the product of their digits. Today's number is the largest of these numbers.
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The digits of the number must be 1, 2 and 3, so the largest number is
321
.
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mean
square numbers
sum to infinity
determinants
complex numbers
graphs
colouring
floors
time
squares
square roots
angles
consecutive numbers
books
advent
indices
triangles
surds
arrows
triangle numbers
chalkdust crossnumber
polygons
geometric means
digits
division
ellipses
algebra
multiplication
shape
sums
factorials
crosswords
calculus
rectangles
averages
pentagons
wordplay
digital clocks
numbers
crossnumber
circles
quadrilaterals
addition
digital products
range
parabolas
cube numbers
sport
spheres
dice
albgebra
expansions
prime numbers
factors
shapes
means
odd numbers
palindromes
scales
consecutive integers
products
matrices
number
3d shapes
planes
axes
doubling
christmas
money
area
cryptic clues
integers
coins
proportion
tournaments
differentiation
dominos
cryptic crossnumbers
regular shapes
even numbers
coordinates
partitions
chocolate
elections
decahedra
balancing
tiling
clocks
irreducible numbers
routes
integration
multiples
median
perimeter
probabilty
cards
bases
perfect numbers
games
dodecagons
unit fractions
star numbers
the only crossnumber
taxicab geometry
sets
binary
cubics
functions
chess
geometry
remainders
sequences
people maths
tangents
rugby
volume
menace
geometric mean
hexagons
symmetry
crossnumbers
combinatorics
logic
quadratics
percentages
speed
probability
2d shapes
folding tube maps
trigonometry
fractions
gerrymandering
grids
pascal's triangle
lines
ave
dates
polynomials
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