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