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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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Archive
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2020
Advent calendar 2019
Sunday Afternoon Maths LXVII
Coloured weights
Not Roman numerals
Advent calendar 2018
List of all puzzles
Tags
differentiation
sequences
colouring
taxicab geometry
perimeter
perfect numbers
clocks
shapes
range
crosswords
regular shapes
money
circles
digits
probabilty
cryptic clues
combinatorics
unit fractions
cube numbers
trigonometry
integers
speed
functions
crossnumbers
palindromes
median
coins
graphs
time
symmetry
christmas
complex numbers
crossnumber
scales
mean
shape
lines
integration
balancing
people maths
volume
angles
multiples
ave
square roots
the only crossnumber
dice
dominos
algebra
doubling
3d shapes
dodecagons
menace
remainders
pascal's triangle
tiling
multiplication
bases
wordplay
proportion
sport
gerrymandering
planes
sums
irreducible numbers
chalkdust crossnumber
chess
cryptic crossnumbers
polygons
coordinates
ellipses
percentages
2d shapes
partitions
elections
surds
prime numbers
arrows
sum to infinity
triangle numbers
squares
advent
floors
games
books
products
quadratics
odd numbers
star numbers
factorials
folding tube maps
chocolate
division
addition
probability
logic
spheres
triangles
geometry
routes
fractions
area
rugby
calculus
hexagons
cards
averages
factors
indices
number
grids
quadrilaterals
dates
means
rectangles
parabolas
numbers
square numbers
digital clocks
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