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A069673
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Nonpalindromic triangular numbers such that the digit reversal is also a triangular number (possibly with fewer digits).
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5
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10, 120, 153, 190, 300, 351, 630, 820, 17578, 87571, 156520, 180300, 185745, 547581, 557040, 678030, 1461195, 1851850, 5911641, 6056940, 12145056, 12517506, 16678200, 56440000, 60571521, 65054121
(list; graph; refs; listen; history; internal format)
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