2, 4, 6, ?, 8, 5, 10, 15, ?, 20, 4, 8, 12, ?, 16, 1, 2, 4, ?, 8, 10, 12, 14, ?, 16, 18, 15, 12, ?, 9, 2, 5, 8, ?, 11, 1, 4, 7, ?, 10, 3, 6, 9, ?, 12, 20, 18, 16, ?, 14.

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