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