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Advent calendar 2015
23 December
All 2015 advent puzzles
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This number is a prime number. If you treble it and add 16, the result is also prime. Repeating this will give 11 prime numbers in total (including the number itself).
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
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List of all puzzles
Tags
pascal's triangle
square numbers
decahedra
perfect numbers
cube numbers
fractions
planes
wordplay
numbers
axes
chalkdust crossnumber
pentagons
shape
surds
irreducible numbers
calculus
cryptic clues
factorials
polynomials
chocolate
prime numbers
hexagons
indices
crosswords
sets
complex numbers
proportion
doubling
clocks
median
functions
colouring
the only crossnumber
number
odd numbers
dodecagons
unit fractions
volume
geometric mean
algebra
spheres
probability
combinatorics
polygons
sport
star numbers
menace
games
differentiation
coordinates
addition
crossnumbers
sequences
money
dice
tangents
tiling
mean
routes
multiples
digital products
time
matrices
area
integers
consecutive integers
sum to infinity
parabolas
multiplication
perimeter
percentages
chess
cards
elections
remainders
advent
digital clocks
binary
books
palindromes
rugby
christmas
trigonometry
cubics
taxicab geometry
cryptic crossnumbers
quadrilaterals
consecutive numbers
ave
range
digits
scales
rectangles
partitions
products
geometric means
sums
means
balancing
gerrymandering
graphs
speed
circles
2d shapes
tournaments
folding tube maps
grids
squares
even numbers
lines
factors
floors
quadratics
triangles
dominos
people maths
geometry
coins
triangle numbers
division
probabilty
arrows
expansions
angles
integration
dates
ellipses
averages
square roots
shapes
logic
determinants
3d shapes
bases
regular shapes
symmetry
albgebra
crossnumber
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