masahixixi

# -*- encoding: utf-8 -*-
require 'twitter'

CONSUMER_KEY       = ""
CONSUMER_SECRET    = ""
OAUTH_TOEKN        = ""
OAUTH_TOEKN_SECRET = ""

Twitter.configure do |config|
  config.consumer_key       = CONSUMER_KEY

masahixixi

a = 1                                                                                      
b = 2 
sum = 0 
ans = 0 
while  sum < 4000000
  if b % 2 == 0
    ans = ans += b
  end 
  sum = a + b
  a = b 

masahixixi

require "prime"                                                                            
p 600851475143.prime_division.last

masahixixi

numbers = []                                                                               
mnumbers = []
mnumbers_rev = []
ans = []
999.downto(1){|down|
  numbers << down
}

numbers.each do |numbers_first|
  numbers.each do |numbers_second|

masahixixi

lcmnum = 11

(12..20).each do |num|
  lcmnum = lcmnum.lcm(num)
end

p lcmnum

masahixixi

sum = 0                                                                                    
prod1 = 0 
prod2 = 0 

(1..100).each do |num|
  prod1 += num ** 2
  sum += num 
end

prod2 = sum ** 2

masahixixi

require "prime"                                                                 
pri = []
num = 2 

while pri.size < 10001
  if Prime.instance.prime?(num) == true
    pri << num 
  end 
  num += 1
end

masahixixi

require "prime"
num = 3 
sum = 2

while num <= 2000000
    sum += num if num.prime?
    num += 2
end

p sum

masahixixi

require "mathn"

num = 2000000 
num_list = (2..num).to_a 
pri_list = Array.new
sum_list = Array.new
tmp = 2
sum = 0

while tmp <= Math.sqrt(num)

masahixixi

number_ary = []
number_string = []
ans = []

number = open("./problem8_number")

while number_data = number.gets
  number_ary <<  number_data.chomp
end