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A116544 Triangular numbers for which the multiplicative digital root is also a triangular number. +0
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0, 1, 3, 6, 10, 28, 45, 55, 78, 105, 120, 190, 210, 231, 253, 276, 300, 325, 378, 406, 435, 465, 528, 561, 595, 630, 703, 741, 780, 820, 861, 903, 990, 1035, 1081, 1128, 1225, 1275, 1378, 1485, 1540, 1596, 1653, 1770, 1830, 2016, 2080, 2145, 2278, 2346, 2415 (list; graph; listen)
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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.


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