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A229262
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Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.
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1
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21, 153, 36, 210, 2415, 3321, 528, 136, 2145, 3655, 666, 378, 1891, 6105, 205120, 185136, 10153, 399171, 63190, 78210, 364231, 5253, 210276, 180300, 11325, 406351, 1378, 81406, 357435, 4465, 215496, 18528, 12561, 413595, 57630, 84666, 65703, 3741, 220780
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