F yellow(n)
   V a = [1, 2, 3]
   V b = Set([1, 2, 3])
   V i = 4
   L n > a.len
      I i !C b & gcd(i, a.last) == 1 & gcd(i, a[(len)-2]) > 1
         a.append(i)
         b.add(i)
         i = 4
      i++
   R a

print(yellow(30))