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Advent calendar 2016
14 December
All 2016 advent puzzles
~
More information
In July, I posted the
Combining Multiples
puzzle.
Today's number is the largest number that cannot be written in the form \(27a+17b\), where \(a\) and \(b\) are positive integers (or 0).
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415
Tags:
numbers
,
factors
,
multiples
,
sums
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Most recent collections
Advent calendar 2025
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List of all puzzles
Tags
division
consecutive numbers
quadrilaterals
parabolas
routes
tangents
expansions
crossnumbers
square numbers
chalkdust crossnumber
geometry
unit fractions
cryptic clues
irreducible numbers
perfect numbers
lists
advent
games
square grids
rectangles
2d shapes
odd numbers
proportion
sequences
scales
cubics
perimeter
tiling
averages
floors
the only crossnumber
regular shapes
squares
geometric means
probability
multiplication
area
volume
money
coordinates
calculus
determinants
doubling
symmetry
fractions
coins
polygons
binary
sets
hexagons
numbers
neighbours
balancing
probabilty
colouring
combinatorics
shape
addition
chocolate
palindromes
dominos
speed
multiples
trigonometry
circles
cube numbers
christmas
crosswords
cards
multiplaction squares
dates
triangles
arrows
elections
factors
means
ave
menace
functions
ellipses
differentiation
indices
graphs
rugby
polynomials
sport
pentagons
star numbers
range
axes
gerrymandering
percentages
logic
clocks
digital products
angles
lines
taxicab geometry
integers
matrices
prime factors
prime numbers
median
dodecagons
folding tube maps
xor
algebra
chess
remainders
geometric mean
even numbers
medians
albgebra
pascal's triangle
bases
consecutive integers
surds
grids
factorials
tournaments
spheres
wordplay
people maths
time
quadratics
number
sum to infinity
3d shapes
partitions
books
shapes
sums
products
triangle numbers
square roots
digital clocks
dice
digits
cryptic crossnumbers
integration
decahedra
planes
complex numbers
powers
mean
© Matthew Scroggs 2012–2026