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Advent calendar 2017
8 December
All 2017 advent puzzles
~
More information
The odd numbers are written in a pyramid.
1
3
5
7
9
11
etc.
What is the mean of the numbers in the 23rd row?
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529
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numbers
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Most recent collections
Advent calendar 2025
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List of all puzzles
Tags
square roots
complex numbers
digits
coordinates
arrows
coins
fractions
grids
books
consecutive numbers
star numbers
expansions
proportion
xor
ave
graphs
triangles
scales
shape
3d shapes
powers
sport
tiling
prime factors
speed
median
range
pentagons
circles
crosswords
factorials
means
unit fractions
multiplaction squares
prime numbers
regular shapes
ellipses
clocks
pascal's triangle
partitions
menace
cards
gerrymandering
wordplay
sums
sequences
dice
lines
square numbers
rectangles
spheres
trigonometry
polynomials
advent
doubling
elections
logic
multiples
medians
cryptic clues
odd numbers
square grids
angles
digital products
matrices
dominos
integers
number
averages
quadrilaterals
tangents
planes
products
dodecagons
indices
multiplication
bases
quadratics
dates
shapes
factors
cube numbers
tournaments
neighbours
chess
crossnumbers
binary
surds
money
functions
sum to infinity
digital clocks
the only crossnumber
albgebra
games
parabolas
addition
lists
decahedra
chalkdust crossnumber
volume
calculus
squares
irreducible numbers
geometric mean
2d shapes
taxicab geometry
symmetry
combinatorics
axes
percentages
division
people maths
floors
colouring
cubics
probability
geometric means
mean
triangle numbers
remainders
time
routes
geometry
integration
christmas
hexagons
perimeter
folding tube maps
probabilty
sets
chocolate
perfect numbers
algebra
polygons
consecutive integers
differentiation
rugby
cryptic crossnumbers
balancing
even numbers
determinants
numbers
area
palindromes
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