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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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Archive
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Most recent collections
Advent calendar 2025
Advent calendar 2024
Advent calendar 2023
Advent calendar 2022
List of all puzzles
Tags
wordplay
digital products
numbers
triangle numbers
determinants
integration
consecutive numbers
chocolate
tournaments
sequences
lists
consecutive integers
dice
square numbers
doubling
squares
tiling
albgebra
prime numbers
digits
coins
prime factors
xor
irreducible numbers
ave
volume
rugby
factors
parabolas
angles
factorials
coordinates
mean
floors
menace
sums
elections
pascal's triangle
hexagons
advent
division
quadrilaterals
shapes
people maths
rectangles
dates
surds
circles
square roots
calculus
shape
geometric mean
christmas
pentagons
planes
logic
addition
sport
averages
clocks
chess
multiples
remainders
unit fractions
crosswords
grids
geometric means
tangents
complex numbers
balancing
arrows
algebra
polygons
triangles
functions
star numbers
cube numbers
cards
speed
graphs
gerrymandering
2d shapes
cryptic clues
odd numbers
medians
probability
palindromes
ellipses
spheres
multiplaction squares
fractions
3d shapes
decahedra
time
folding tube maps
combinatorics
perimeter
symmetry
colouring
trigonometry
products
indices
geometry
bases
games
binary
perfect numbers
matrices
chalkdust crossnumber
lines
crossnumbers
means
integers
expansions
cryptic crossnumbers
dodecagons
multiplication
percentages
area
dominos
regular shapes
square grids
taxicab geometry
differentiation
routes
books
quadratics
neighbours
proportion
partitions
money
median
the only crossnumber
probabilty
digital clocks
powers
axes
scales
sets
sum to infinity
cubics
even numbers
polynomials
number
range
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