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Advent calendar 2017
7 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 sum of the numbers in the seventh row?
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343
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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
sets
tangents
indices
algebra
squares
axes
colouring
floors
coordinates
mean
quadratics
geometry
neighbours
3d shapes
ellipses
triangle numbers
cryptic clues
numbers
crossnumbers
median
sequences
integers
xor
odd numbers
time
square grids
factors
wordplay
remainders
christmas
2d shapes
binary
range
albgebra
unit fractions
geometric means
matrices
books
chocolate
elections
parabolas
sum to infinity
shape
planes
people maths
addition
complex numbers
gerrymandering
menace
crosswords
dodecagons
multiplaction squares
the only crossnumber
combinatorics
folding tube maps
expansions
circles
advent
cryptic crossnumbers
cards
routes
consecutive integers
chess
dice
sums
calculus
sport
products
dates
shapes
area
even numbers
digits
graphs
games
proportion
determinants
differentiation
square roots
factorials
polygons
quadrilaterals
partitions
digital products
perfect numbers
spheres
hexagons
digital clocks
lists
angles
square numbers
symmetry
grids
means
averages
doubling
multiples
clocks
pentagons
bases
surds
volume
decahedra
chalkdust crossnumber
cubics
percentages
logic
taxicab geometry
arrows
fractions
polynomials
number
integration
lines
probabilty
money
irreducible numbers
division
ave
palindromes
speed
pascal's triangle
multiplication
star numbers
regular shapes
tiling
dominos
geometric mean
coins
balancing
functions
perimeter
prime numbers
rectangles
tournaments
consecutive numbers
scales
rugby
medians
trigonometry
powers
probability
prime factors
cube numbers
triangles
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