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