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