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Advent calendar 2020
23 December
All 2020 advent puzzles
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198 is the smallest number that is equal to 11 times the sum of its digits.
Today's number is the smallest number that is equal to 48 times the sum of its digits.
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We're looking for a number \(n\) such that the digits of \(n\times48\) add up to \(n\). If we try numbers in order, we find that 9 works, so today's number is
432
.
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prime numbers
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folding tube maps
probability
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hexagons
indices
sport
determinants
addition
surds
colouring
unit fractions
grids
multiples
wordplay
time
averages
ellipses
percentages
triangles
chalkdust crossnumber
digital products
cards
area
dates
dodecagons
people maths
perfect numbers
triangle numbers
symmetry
the only crossnumber
gerrymandering
geometric mean
coordinates
factorials
regular shapes
scales
products
consecutive integers
arrows
cubics
perimeter
tangents
dominos
albgebra
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