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COMMENT
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Numbers appearing twice in this sequence are: {2, 3, 4, 9, 14, 21, 29, 38, 49, 61, 72, 88, 102, 119, 121, 137, 156, 178, 199, 222, 244, 270, 272, 296, 298, 323, 325, 354, 382, 386, 416, 449, 483, 516, 552, 589, 628, 666, 668, 708, 750, 752, 793, 795, 837, 839, 883, 885, 930, 933, 979, 1026, 1030, 1076, 1081, 1129, 1181, 1237, 1290, 1349, 1406, 1462, 1466, 1524, 1527, 1584, 1587, 1646, 1649, 1712, 1774, 1777, 1779, 1842, 1909, 1976, 1978, 2045, 2047, 2117, 2119, ...}. - Hans Havermann (pxp(AT)rogers.com), Jan 10 2006
Numbers (>1) not appearing at all are: {120, 271, 297, 324, 385, 667, 751, 794, 838, 884, 931, 1029, 1080, 1463, 1526, 1585, 1647, 1775, 1778, 1977, 2046, 2118, ...}. - Hans Havermann (pxp(AT)rogers.com), Jan 10 2006
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