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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
algebra
indices
probability
fractions
albgebra
expansions
taxicab geometry
sum to infinity
xor
functions
colouring
grids
sets
volume
dates
floors
consecutive numbers
arrows
tournaments
shapes
the only crossnumber
time
3d shapes
cubics
integration
chocolate
consecutive integers
symmetry
rectangles
polygons
square roots
square grids
parabolas
matrices
triangle numbers
crossnumbers
integers
quadratics
bases
rugby
trigonometry
games
cube numbers
powers
differentiation
squares
odd numbers
hexagons
sport
chess
medians
menace
perfect numbers
neighbours
folding tube maps
books
people maths
digital products
square numbers
tangents
2d shapes
irreducible numbers
proportion
ellipses
graphs
polynomials
probabilty
speed
scales
geometric mean
tiling
ave
multiplication
dice
cryptic clues
regular shapes
factorials
planes
percentages
binary
means
geometric means
dodecagons
angles
balancing
prime numbers
spheres
chalkdust crossnumber
cards
cryptic crossnumbers
partitions
triangles
quadrilaterals
clocks
numbers
coins
prime factors
multiples
remainders
coordinates
sums
factors
shape
lists
routes
digital clocks
median
division
perimeter
averages
money
advent
complex numbers
dominos
palindromes
lines
range
digits
decahedra
number
unit fractions
surds
logic
determinants
gerrymandering
addition
even numbers
area
axes
christmas
combinatorics
multiplaction squares
wordplay
doubling
calculus
pentagons
geometry
pascal's triangle
products
star numbers
circles
sequences
elections
crosswords
mean
© Matthew Scroggs 2012–2026