"15", "1, 3, 5, 15" "3", "1, 3" "18", "1, 2, 3, 6, 9, 18" "25", "1, 5, 25" "27", "1, 3, 9, 27" "12", "1, 2, 3, 4, 6, 12" "31", "1, 31" "16", "1, 2, 4, 8, 16" "20", "1, 2, 4, 5, 10, 20" "4", "1, 2, 4"
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