m = {1 => ""}
r = 1
p = ''
(1..100).each { |c|
  mof = c % 5 == 0
  mot = c % 3 == 0
  done = mot && !mof && (c + 1) % 5 != 0 && (c + 2) % 5 != 0
  if mot && !mof    
    c.to_s.length.times { m[r] << " "} unless done
    r += 1
    if m[r].nil? #newline
      m[r] = ""
      (m[r-1].to_s.length - c.to_s.length).times { m[r] << " " }
    end
  elsif mof && !mot
    c.to_s.length.times { m[r] << " "}  
    r -= 1
  end
  
  c.to_s.length.times { m[r-1] << " " } if r != 1 &&  !mot 
  c.to_s.length.times { m[r+1] << " " } if !m[r+1].nil? &&  !mof
   
   m[r] << c.to_s
   p += m[r-1] + "\n" if done
}
puts p + m[r] + "\n" + m[r+1]