prabes

# This algorithm only works upto 23 digits.
# As I found 10**9942066 is the maximum calculation ruby can perform without overflowing into infinity
# ie, any number greater than 109942066 will overflow to infinity. 
   
class CuriousNumber

  def calculate(i)
    
    a = 5**(2**i) % 10**i
    b = (10**i)+1 - a

prabes

#require 'byebug'
  puts "Enter a number:"
  number = gets.chomp.to_i

#method takes sum of square and an array 
def happy square_sum, array=[]
  
  #gets individual number in an array 
  num = square_sum.digits