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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
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prime numbers
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palindromes
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
digital clocks
3d shapes
routes
addition
calculus
quadratics
sport
spheres
folding tube maps
hexagons
geometry
quadrilaterals
functions
tangents
pascal's triangle
books
taxicab geometry
2d shapes
gerrymandering
chalkdust crossnumber
cryptic clues
people maths
squares
combinatorics
probability
dice
albgebra
products
axes
polygons
probabilty
bases
unit fractions
crossnumbers
arrows
menace
odd numbers
speed
perfect numbers
indices
number
doubling
pentagons
square roots
perimeter
star numbers
dodecagons
even numbers
algebra
sum to infinity
means
symmetry
cube numbers
ellipses
digits
regular shapes
geometric means
elections
trigonometry
shape
shapes
range
chocolate
consecutive numbers
tiling
sequences
chess
determinants
ave
integers
tournaments
the only crossnumber
consecutive integers
triangle numbers
circles
crosswords
cryptic crossnumbers
planes
averages
floors
proportion
percentages
coins
sets
decahedra
mean
square numbers
coordinates
matrices
factors
digital products
fractions
factorials
multiplication
logic
colouring
crossnumber
cubics
binary
area
cards
graphs
division
median
scales
prime numbers
multiples
money
geometric mean
numbers
rugby
triangles
complex numbers
angles
wordplay
polynomials
parabolas
surds
grids
time
palindromes
partitions
remainders
balancing
christmas
expansions
irreducible numbers
integration
advent
dominos
clocks
rectangles
dates
sums
differentiation
volume
games
lines
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