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