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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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587
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Advent calendar 2024
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means
chocolate
menace
powers
geometry
numbers
digital products
graphs
people maths
3d shapes
consecutive integers
balancing
differentiation
factorials
arrows
indices
trigonometry
coordinates
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sets
irreducible numbers
speed
geometric means
unit fractions
pentagons
digits
books
volume
fractions
time
shapes
number
tournaments
cryptic crossnumbers
ellipses
rugby
complex numbers
taxicab geometry
lines
multiplication
palindromes
christmas
percentages
folding tube maps
probability
games
surds
sport
tiling
star numbers
polygons
sums
tangents
crossnumbers
neighbours
bases
spheres
proportion
triangle numbers
floors
cubics
the only crossnumber
chess
median
functions
probabilty
products
symmetry
cards
digital clocks
determinants
money
multiples
crosswords
decahedra
shape
integration
calculus
elections
clocks
parabolas
sum to infinity
rectangles
cube numbers
medians
routes
circles
sequences
crossnumber
binary
prime numbers
square numbers
mean
angles
triangles
matrices
2d shapes
combinatorics
square roots
regular shapes
remainders
dominos
odd numbers
dice
chalkdust crossnumber
colouring
quadratics
expansions
partitions
division
perimeter
factors
range
coins
cryptic clues
polynomials
geometric mean
addition
wordplay
scales
quadrilaterals
integers
axes
doubling
area
planes
logic
albgebra
even numbers
gerrymandering
dates
numbers grids
grids
pascal's triangle
averages
ave
consecutive numbers
squares
dodecagons
square grids
hexagons
algebra
perfect numbers
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