factor dbb9bb42cae3e9c0b6b92d580fa66afe15f2b614 (scratchpad) foo 0 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 8 8 9 9 9 9 9 9 10 10 10 10 10 10 10 10 11 11 11 11 11 11 11 12 12 12 12 12 12 12 12 12 13 13 13 13 13 13 13 13 13 13 13 14 14 14 14 14 14 14 14 14 14 14 14 14 14 13 << !! 14 14 15 15 15 16 16 17 17 17 17 16 << !! 18 18 18 19 19 19 19 20 20 20 20 20