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