m = {1 => ""}
r = 1
p = ''
(1..100).each { |c|
  mof = c % 5 == 0
  mot = c % 3 == 0
  f = c > 9 ? "  " : " "
  done = mot && !mof && (c + 1) % 5 != 0 && (c + 2) % 5 != 0
  if mot && !mof    
    m[r] << f unless done
    r += 1
    if m[r].nil?
      m[r] = ""
      (m[r-1].to_s.length - c.to_s.length).times { m[r] << " " }
    end
  elsif mof && !mot
    m[r] << f 
    r -= 1
  end
  m[r-1] << f if r != 1 &&  !mot 
  m[r+1] << f if !m[r+1].nil? &&  !mof
  m[r] << c.to_s
  p += m[r-1].to_s + "\n" if done
}
puts p + m[r] + "\n" + m[r+1]