Project Euler 003

Hey, here is Problem 3.  Not the most complicated problem.  However, this version requires you to enter an argument in the command line.

#Project Euler
#Problem 3

require 'mathn'

usr_num = ARGV[0].to_i
puts usr_num.prime_division.last[0]

Project Euler 002

Hey, glad I got some followers.  This is my response to the second one (check the link in the title of the post for the prompt).  I recommend Project Euler as a way of jumping into Ruby, especially if you love Math.


#Project Euler
#Problem 2

a, b, sum = 1,2,0

while b < 4000000
  sum += b if b.even?
  a,b = b,a+b
end
puts sum

Project Euler 001

I have decided to use this blog to display the source code for Project Euler answers (and eventually other programming challenges as well).  Enjoy!

#Project Euler
#Problem 1

x , total = 0,0
while x < 1000
  total += x if x % 3 == 0 || x % 5 == 0
  x+=1
end
range = 0..999
a = range.inject(0) do |sum,element|
  element%3==0 || element%5==0 ? sum+element : sum
end
puts total
puts a

Post #2!!!

Today I mailed some textbooks I sold on eBay.  It was so nice to make back a little money considering how much they cost new.  Have any stories about your eBay experiences?  Post them as comments!