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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
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Most recent collections
Advent calendar 2025
Advent calendar 2024
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Advent calendar 2022
List of all puzzles
Tags
coordinates
means
probability
lines
complex numbers
area
dice
books
menace
star numbers
polynomials
the only crossnumber
ellipses
planes
taxicab geometry
averages
hexagons
quadratics
polygons
digital clocks
axes
cubics
digits
decahedra
shape
chocolate
regular shapes
consecutive integers
numbers
palindromes
binary
prime factors
triangles
geometric mean
clocks
perimeter
matrices
even numbers
multiplaction squares
geometric means
pascal's triangle
partitions
cryptic crossnumbers
tournaments
percentages
cryptic clues
albgebra
powers
chess
trigonometry
elections
square roots
digital products
money
xor
pentagons
proportion
odd numbers
grids
coins
dates
crosswords
spheres
prime numbers
quadrilaterals
sport
surds
neighbours
differentiation
addition
irreducible numbers
tiling
time
number
products
integers
arrows
multiplication
square numbers
triangle numbers
dominos
shapes
sets
consecutive numbers
folding tube maps
squares
determinants
indices
speed
cube numbers
circles
mean
combinatorics
colouring
volume
christmas
multiples
games
graphs
floors
range
division
geometry
ave
lists
median
rectangles
chalkdust crossnumber
advent
factors
doubling
perfect numbers
square grids
symmetry
expansions
medians
factorials
wordplay
integration
parabolas
cards
sum to infinity
fractions
functions
calculus
people maths
dodecagons
balancing
remainders
3d shapes
routes
angles
scales
logic
sums
unit fractions
probabilty
gerrymandering
bases
rugby
crossnumbers
2d shapes
algebra
tangents
sequences
© Matthew Scroggs 2012–2026