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Advent calendar 2015
17 December
All 2015 advent puzzles
~
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In March, I posted the puzzle
One Hundred Factorial
, which asked how many zeros 100! ends with.
What is the smallest number, n, such that n! ends with 50 zeros?
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205
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numbers
,
factorials
,
multiplication
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
christmas
partitions
palindromes
scales
rugby
probabilty
folding tube maps
multiplication
even numbers
angles
sequences
geometric means
bases
pentagons
perfect numbers
shapes
rectangles
expansions
digital clocks
functions
dice
parabolas
irreducible numbers
crossnumbers
numbers
money
matrices
spheres
menace
colouring
perimeter
decahedra
volume
complex numbers
taxicab geometry
digital products
games
symmetry
the only crossnumber
remainders
shape
products
star numbers
square roots
albgebra
coordinates
advent
percentages
quadratics
geometry
crosswords
polygons
determinants
addition
wordplay
range
triangles
ellipses
combinatorics
cryptic clues
sets
unit fractions
differentiation
3d shapes
cards
digits
dates
trigonometry
arrows
sport
averages
integers
ave
polynomials
prime numbers
axes
cryptic crossnumbers
dominos
planes
2d shapes
time
balancing
integration
means
algebra
pascal's triangle
doubling
odd numbers
median
factors
factorials
chess
gerrymandering
graphs
number
tangents
circles
division
chalkdust crossnumber
square numbers
sums
surds
indices
quadrilaterals
probability
logic
speed
clocks
mean
sum to infinity
tiling
geometric mean
lines
multiples
consecutive integers
calculus
triangle numbers
dodecagons
floors
cubics
binary
people maths
books
crossnumber
grids
routes
consecutive numbers
proportion
elections
tournaments
area
chocolate
regular shapes
coins
fractions
hexagons
cube numbers
squares
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