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