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Advent calendar 2015
14 December
All 2015 advent puzzles
~
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What is the only palindromic three digit prime number which is also palindromic when written in binary?
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313
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numbers
,
prime numbers
,
palindromes
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dodecagons
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doubling
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the only crossnumber
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christmas
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advent
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sum to infinity
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ave
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multiplication
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Most recent collections
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
List of all puzzles
Tags
multiplication
bases
square numbers
even numbers
neighbours
coins
averages
spheres
albgebra
binary
scales
determinants
pentagons
folding tube maps
probability
rugby
medians
range
elections
palindromes
colouring
christmas
grids
triangles
doubling
shape
angles
axes
lines
advent
graphs
tiling
differentiation
numbers
quadrilaterals
algebra
trigonometry
the only crossnumber
fractions
digital clocks
speed
chess
matrices
people maths
tournaments
rectangles
regular shapes
unit fractions
sums
division
numbers grids
balancing
chocolate
expansions
geometric mean
ave
partitions
floors
dodecagons
quadratics
square grids
crossnumbers
arrows
taxicab geometry
tangents
square roots
sum to infinity
squares
geometry
geometric means
wordplay
perfect numbers
consecutive integers
money
complex numbers
shapes
prime numbers
chalkdust crossnumber
cubics
mean
circles
factorials
means
triangle numbers
logic
proportion
surds
factors
2d shapes
dominos
cryptic crossnumbers
clocks
ellipses
cube numbers
books
sport
remainders
calculus
addition
3d shapes
integration
median
digital products
crosswords
parabolas
dice
powers
integers
odd numbers
cards
percentages
routes
sequences
area
functions
probabilty
star numbers
perimeter
consecutive numbers
volume
symmetry
polygons
pascal's triangle
time
dates
planes
multiples
decahedra
combinatorics
menace
indices
sets
products
polynomials
hexagons
cryptic clues
digits
number
games
coordinates
gerrymandering
irreducible numbers
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