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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
Show me a random puzzle
▼ show ▼
▲ hide ▲
Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
integration
menace
area
chocolate
crossnumbers
rectangles
proportion
sequences
shape
even numbers
spheres
unit fractions
rugby
consecutive numbers
triangles
multiplication
money
quadratics
wordplay
parabolas
consecutive integers
tangents
chess
doubling
graphs
dominos
chalkdust crossnumber
expansions
taxicab geometry
speed
products
circles
mean
angles
number
volume
ellipses
cryptic clues
albgebra
crosswords
regular shapes
scales
probability
surds
binary
2d shapes
elections
fractions
numbers
factors
advent
ave
functions
probabilty
multiples
hexagons
trigonometry
perfect numbers
combinatorics
indices
cube numbers
gerrymandering
decahedra
remainders
sets
irreducible numbers
odd numbers
christmas
star numbers
differentiation
algebra
percentages
square roots
cryptic crossnumbers
routes
triangle numbers
integers
geometric means
planes
matrices
coins
digital clocks
square numbers
shapes
cubics
digits
arrows
games
people maths
grids
range
balancing
tiling
symmetry
sport
means
polygons
bases
determinants
coordinates
colouring
digital products
division
sum to infinity
averages
tournaments
dates
prime numbers
factorials
floors
pentagons
dodecagons
pascal's triangle
polynomials
perimeter
partitions
clocks
the only crossnumber
addition
palindromes
dice
books
median
squares
crossnumber
complex numbers
calculus
quadrilaterals
geometric mean
axes
folding tube maps
3d shapes
sums
cards
geometry
lines
time
logic
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