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1, 3, 7, 9, 33, 99, 111, 141, 151, 171, 303, 393, 535, 717, 727, 777, 787, 979, 1441, 1771, 3003, 3223, 3663, 5335, 7447, 9009, 9339, 9999, 10501, 11011, 11811, 11911, 12121, 12321, 12621, 13531, 13831, 14041, 14541, 14841, 17671, 18181
(list; graph; refs; listen; history; internal format)
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