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Advent calendar 2017
11 December
All 2017 advent puzzles
~
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Two more than today's number is the reverse of two times today's number.
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497
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digits
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Archive
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
prime factors
cubics
polygons
number
elections
factorials
advent
consecutive numbers
partitions
consecutive integers
geometric mean
multiplaction squares
money
addition
symmetry
balancing
hexagons
wordplay
volume
square numbers
complex numbers
crosswords
cube numbers
determinants
multiplication
arrows
gerrymandering
functions
integers
coordinates
sets
polynomials
calculus
prime numbers
medians
rugby
palindromes
remainders
tiling
dice
trigonometry
range
pentagons
cryptic clues
menace
parabolas
dodecagons
digital clocks
median
crossnumbers
dates
integration
averages
cryptic crossnumbers
people maths
means
geometric means
probabilty
differentiation
sums
neighbours
quadrilaterals
games
lines
books
triangles
perfect numbers
products
planes
star numbers
angles
expansions
xor
dominos
surds
rectangles
matrices
bases
circles
square grids
numbers
taxicab geometry
tournaments
shapes
christmas
time
unit fractions
chocolate
cards
odd numbers
floors
perimeter
factors
axes
geometry
ellipses
mean
binary
division
ave
folding tube maps
graphs
square roots
triangle numbers
algebra
clocks
pascal's triangle
chalkdust crossnumber
sum to infinity
digital products
fractions
scales
grids
3d shapes
indices
quadratics
regular shapes
lists
digits
doubling
chess
logic
multiples
coins
albgebra
powers
colouring
sport
2d shapes
tangents
percentages
irreducible numbers
the only crossnumber
decahedra
sequences
proportion
squares
area
shape
probability
speed
combinatorics
routes
even numbers
spheres
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