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