m = {1 => ""}
r = 1
rd = {1 => 0}
(1..100).each do |c|

  if c % 3 == 0 && c % 5 > 0    
    rd[r] += 1
    c.to_s.length.times { m[r] << " "} unless rd[r] == 2
    r += 1
  end
  
  if c % 5 == 0 && c % 3 > 0
    c.to_s.length.times { m[r] << " "}  
    r -= 1
  end
  if m[r].nil?
    m[r] = ""
    rd[r] = 0
    (m[r-1].to_s.length - c.to_s.length).times { m[r] << " " }
  end
  c.to_s.length.times { m[r-1] << " " } unless r == 1 ||  c % 3 ==  0 ||  rd[r-1] == 2
  c.to_s.length.times { m[r+1] << " " } unless m[r+1].nil? ||  c % 5 ==  0
   
   m[r] << c.to_s
end

(1..15).each {|i| puts m[i].to_s}



#this is a test